diff --git a/poetry.lock b/poetry.lock
index 46571fb..529f25d 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -108,7 +108,7 @@ description = "Code coverage measurement for Python"
 name = "coverage"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
-version = "5.0.3"
+version = "5.2.1"
 
 [package.extras]
 toml = ["toml"]
@@ -598,7 +598,7 @@ pathtools = ">=0.1.1"
 watchmedo = ["PyYAML (>=3.10)", "argh (>=0.24.1)"]
 
 [metadata]
-content-hash = "cd0d0527cc7e4d53ef830b5605d25524350acc155753fca6bcf915cfbea6bb77"
+content-hash = "a35ab10bbce149ab707f3ec0796e878ebb93ab08b38414b48758fd2ec540b9af"
 python-versions = "^3.6"
 
 [metadata.files]
@@ -647,37 +647,40 @@ colorama = [
     {file = "colorama-0.4.3.tar.gz", hash = "sha256:e96da0d330793e2cb9485e9ddfd918d456036c7149416295932478192f4436a1"},
 ]
 coverage = [
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-    {file = "coverage-5.0.3-cp27-cp27m-macosx_10_13_intel.whl", hash = "sha256:be18f4ae5a9e46edae3f329de2191747966a34a3d93046dbdf897319923923bc"},
-    {file = "coverage-5.0.3-cp27-cp27m-manylinux1_i686.whl", hash = "sha256:3230d1003eec018ad4a472d254991e34241e0bbd513e97a29727c7c2f637bd2a"},
-    {file = "coverage-5.0.3-cp27-cp27m-manylinux1_x86_64.whl", hash = "sha256:e69215621707119c6baf99bda014a45b999d37602cb7043d943c76a59b05bf52"},
-    {file = "coverage-5.0.3-cp27-cp27m-win32.whl", hash = "sha256:1daa3eceed220f9fdb80d5ff950dd95112cd27f70d004c7918ca6dfc6c47054c"},
-    {file = "coverage-5.0.3-cp27-cp27m-win_amd64.whl", hash = "sha256:51bc7710b13a2ae0c726f69756cf7ffd4362f4ac36546e243136187cfcc8aa73"},
-    {file = "coverage-5.0.3-cp27-cp27mu-manylinux1_i686.whl", hash = "sha256:9bea19ac2f08672636350f203db89382121c9c2ade85d945953ef3c8cf9d2a68"},
-    {file = "coverage-5.0.3-cp27-cp27mu-manylinux1_x86_64.whl", hash = "sha256:5012d3b8d5a500834783689a5d2292fe06ec75dc86ee1ccdad04b6f5bf231691"},
-    {file = "coverage-5.0.3-cp35-cp35m-macosx_10_12_x86_64.whl", hash = "sha256:d513cc3db248e566e07a0da99c230aca3556d9b09ed02f420664e2da97eac301"},
-    {file = "coverage-5.0.3-cp35-cp35m-manylinux1_i686.whl", hash = "sha256:3dbb72eaeea5763676a1a1efd9b427a048c97c39ed92e13336e726117d0b72bf"},
-    {file = "coverage-5.0.3-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:15cf13a6896048d6d947bf7d222f36e4809ab926894beb748fc9caa14605d9c3"},
-    {file = "coverage-5.0.3-cp35-cp35m-win32.whl", hash = "sha256:fca1669d464f0c9831fd10be2eef6b86f5ebd76c724d1e0706ebdff86bb4adf0"},
-    {file = "coverage-5.0.3-cp35-cp35m-win_amd64.whl", hash = "sha256:1e44a022500d944d42f94df76727ba3fc0a5c0b672c358b61067abb88caee7a0"},
-    {file = "coverage-5.0.3-cp36-cp36m-macosx_10_13_x86_64.whl", hash = "sha256:b26aaf69713e5674efbde4d728fb7124e429c9466aeaf5f4a7e9e699b12c9fe2"},
-    {file = "coverage-5.0.3-cp36-cp36m-manylinux1_i686.whl", hash = "sha256:722e4557c8039aad9592c6a4213db75da08c2cd9945320220634f637251c3894"},
-    {file = "coverage-5.0.3-cp36-cp36m-manylinux1_x86_64.whl", hash = "sha256:7afad9835e7a651d3551eab18cbc0fdb888f0a6136169fbef0662d9cdc9987cf"},
-    {file = "coverage-5.0.3-cp36-cp36m-win32.whl", hash = "sha256:25dbf1110d70bab68a74b4b9d74f30e99b177cde3388e07cc7272f2168bd1477"},
-    {file = "coverage-5.0.3-cp36-cp36m-win_amd64.whl", hash = "sha256:c312e57847db2526bc92b9bfa78266bfbaabac3fdcd751df4d062cd4c23e46dc"},
-    {file = "coverage-5.0.3-cp37-cp37m-macosx_10_13_x86_64.whl", hash = "sha256:a8b8ac7876bc3598e43e2603f772d2353d9931709345ad6c1149009fd1bc81b8"},
-    {file = "coverage-5.0.3-cp37-cp37m-manylinux1_i686.whl", hash = "sha256:527b4f316e6bf7755082a783726da20671a0cc388b786a64417780b90565b987"},
-    {file = "coverage-5.0.3-cp37-cp37m-manylinux1_x86_64.whl", hash = "sha256:d649dc0bcace6fcdb446ae02b98798a856593b19b637c1b9af8edadf2b150bea"},
-    {file = "coverage-5.0.3-cp37-cp37m-win32.whl", hash = "sha256:cd60f507c125ac0ad83f05803063bed27e50fa903b9c2cfee3f8a6867ca600fc"},
-    {file = "coverage-5.0.3-cp37-cp37m-win_amd64.whl", hash = "sha256:c60097190fe9dc2b329a0eb03393e2e0829156a589bd732e70794c0dd804258e"},
-    {file = "coverage-5.0.3-cp38-cp38-macosx_10_13_x86_64.whl", hash = "sha256:d7008a6796095a79544f4da1ee49418901961c97ca9e9d44904205ff7d6aa8cb"},
-    {file = "coverage-5.0.3-cp38-cp38-manylinux1_i686.whl", hash = "sha256:ea9525e0fef2de9208250d6c5aeeee0138921057cd67fcef90fbed49c4d62d37"},
-    {file = "coverage-5.0.3-cp38-cp38-manylinux1_x86_64.whl", hash = "sha256:c62a2143e1313944bf4a5ab34fd3b4be15367a02e9478b0ce800cb510e3bbb9d"},
-    {file = "coverage-5.0.3-cp38-cp38m-win32.whl", hash = "sha256:b0840b45187699affd4c6588286d429cd79a99d509fe3de0f209594669bb0954"},
-    {file = "coverage-5.0.3-cp38-cp38m-win_amd64.whl", hash = "sha256:76e2057e8ffba5472fd28a3a010431fd9e928885ff480cb278877c6e9943cc2e"},
-    {file = "coverage-5.0.3-cp39-cp39m-win32.whl", hash = "sha256:b63dd43f455ba878e5e9f80ba4f748c0a2156dde6e0e6e690310e24d6e8caf40"},
-    {file = "coverage-5.0.3-cp39-cp39m-win_amd64.whl", hash = "sha256:da93027835164b8223e8e5af2cf902a4c80ed93cb0909417234f4a9df3bcd9af"},
-    {file = "coverage-5.0.3.tar.gz", hash = "sha256:77afca04240c40450c331fa796b3eab6f1e15c5ecf8bf2b8bee9706cd5452fef"},
+    {file = "coverage-5.2.1-cp27-cp27m-macosx_10_13_intel.whl", hash = "sha256:40f70f81be4d34f8d491e55936904db5c527b0711b2a46513641a5729783c2e4"},
+    {file = "coverage-5.2.1-cp27-cp27m-macosx_10_9_x86_64.whl", hash = "sha256:675192fca634f0df69af3493a48224f211f8db4e84452b08d5fcebb9167adb01"},
+    {file = "coverage-5.2.1-cp27-cp27m-manylinux1_i686.whl", hash = "sha256:2fcc8b58953d74d199a1a4d633df8146f0ac36c4e720b4a1997e9b6327af43a8"},
+    {file = "coverage-5.2.1-cp27-cp27m-manylinux1_x86_64.whl", hash = "sha256:64c4f340338c68c463f1b56e3f2f0423f7b17ba6c3febae80b81f0e093077f59"},
+    {file = "coverage-5.2.1-cp27-cp27m-win32.whl", hash = "sha256:52f185ffd3291196dc1aae506b42e178a592b0b60a8610b108e6ad892cfc1bb3"},
+    {file = "coverage-5.2.1-cp27-cp27m-win_amd64.whl", hash = "sha256:30bc103587e0d3df9e52cd9da1dd915265a22fad0b72afe54daf840c984b564f"},
+    {file = "coverage-5.2.1-cp27-cp27mu-manylinux1_i686.whl", hash = "sha256:9ea749fd447ce7fb1ac71f7616371f04054d969d412d37611716721931e36efd"},
+    {file = "coverage-5.2.1-cp27-cp27mu-manylinux1_x86_64.whl", hash = "sha256:ce7866f29d3025b5b34c2e944e66ebef0d92e4a4f2463f7266daa03a1332a651"},
+    {file = "coverage-5.2.1-cp35-cp35m-macosx_10_13_x86_64.whl", hash = "sha256:4869ab1c1ed33953bb2433ce7b894a28d724b7aa76c19b11e2878034a4e4680b"},
+    {file = "coverage-5.2.1-cp35-cp35m-manylinux1_i686.whl", hash = "sha256:a3ee9c793ffefe2944d3a2bd928a0e436cd0ac2d9e3723152d6fd5398838ce7d"},
+    {file = "coverage-5.2.1-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:28f42dc5172ebdc32622a2c3f7ead1b836cdbf253569ae5673f499e35db0bac3"},
+    {file = "coverage-5.2.1-cp35-cp35m-win32.whl", hash = "sha256:e26c993bd4b220429d4ec8c1468eca445a4064a61c74ca08da7429af9bc53bb0"},
+    {file = "coverage-5.2.1-cp35-cp35m-win_amd64.whl", hash = "sha256:4186fc95c9febeab5681bc3248553d5ec8c2999b8424d4fc3a39c9cba5796962"},
+    {file = "coverage-5.2.1-cp36-cp36m-macosx_10_13_x86_64.whl", hash = "sha256:b360d8fd88d2bad01cb953d81fd2edd4be539df7bfec41e8753fe9f4456a5082"},
+    {file = "coverage-5.2.1-cp36-cp36m-manylinux1_i686.whl", hash = "sha256:1adb6be0dcef0cf9434619d3b892772fdb48e793300f9d762e480e043bd8e716"},
+    {file = "coverage-5.2.1-cp36-cp36m-manylinux1_x86_64.whl", hash = "sha256:098a703d913be6fbd146a8c50cc76513d726b022d170e5e98dc56d958fd592fb"},
+    {file = "coverage-5.2.1-cp36-cp36m-win32.whl", hash = "sha256:962c44070c281d86398aeb8f64e1bf37816a4dfc6f4c0f114756b14fc575621d"},
+    {file = "coverage-5.2.1-cp36-cp36m-win_amd64.whl", hash = "sha256:b1ed2bdb27b4c9fc87058a1cb751c4df8752002143ed393899edb82b131e0546"},
+    {file = "coverage-5.2.1-cp37-cp37m-macosx_10_13_x86_64.whl", hash = "sha256:c890728a93fffd0407d7d37c1e6083ff3f9f211c83b4316fae3778417eab9811"},
+    {file = "coverage-5.2.1-cp37-cp37m-manylinux1_i686.whl", hash = "sha256:538f2fd5eb64366f37c97fdb3077d665fa946d2b6d95447622292f38407f9258"},
+    {file = "coverage-5.2.1-cp37-cp37m-manylinux1_x86_64.whl", hash = "sha256:27ca5a2bc04d68f0776f2cdcb8bbd508bbe430a7bf9c02315cd05fb1d86d0034"},
+    {file = "coverage-5.2.1-cp37-cp37m-win32.whl", hash = "sha256:aab75d99f3f2874733946a7648ce87a50019eb90baef931698f96b76b6769a46"},
+    {file = "coverage-5.2.1-cp37-cp37m-win_amd64.whl", hash = "sha256:c2ff24df02a125b7b346c4c9078c8936da06964cc2d276292c357d64378158f8"},
+    {file = "coverage-5.2.1-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:304fbe451698373dc6653772c72c5d5e883a4aadaf20343592a7abb2e643dae0"},
+    {file = "coverage-5.2.1-cp38-cp38-manylinux1_i686.whl", hash = "sha256:c96472b8ca5dc135fb0aa62f79b033f02aa434fb03a8b190600a5ae4102df1fd"},
+    {file = "coverage-5.2.1-cp38-cp38-manylinux1_x86_64.whl", hash = "sha256:8505e614c983834239f865da2dd336dcf9d72776b951d5dfa5ac36b987726e1b"},
+    {file = "coverage-5.2.1-cp38-cp38-win32.whl", hash = "sha256:700997b77cfab016533b3e7dbc03b71d33ee4df1d79f2463a318ca0263fc29dd"},
+    {file = "coverage-5.2.1-cp38-cp38-win_amd64.whl", hash = "sha256:46794c815e56f1431c66d81943fa90721bb858375fb36e5903697d5eef88627d"},
+    {file = "coverage-5.2.1-cp39-cp39-macosx_10_13_x86_64.whl", hash = "sha256:16042dc7f8e632e0dcd5206a5095ebd18cb1d005f4c89694f7f8aafd96dd43a3"},
+    {file = "coverage-5.2.1-cp39-cp39-manylinux1_i686.whl", hash = "sha256:c1bbb628ed5192124889b51204de27c575b3ffc05a5a91307e7640eff1d48da4"},
+    {file = "coverage-5.2.1-cp39-cp39-manylinux1_x86_64.whl", hash = "sha256:4f6428b55d2916a69f8d6453e48a505c07b2245653b0aa9f0dee38785939f5e4"},
+    {file = "coverage-5.2.1-cp39-cp39-win32.whl", hash = "sha256:9e536783a5acee79a9b308be97d3952b662748c4037b6a24cbb339dc7ed8eb89"},
+    {file = "coverage-5.2.1-cp39-cp39-win_amd64.whl", hash = "sha256:b8f58c7db64d8f27078cbf2a4391af6aa4e4767cc08b37555c4ae064b8558d9b"},
+    {file = "coverage-5.2.1.tar.gz", hash = "sha256:a34cb28e0747ea15e82d13e14de606747e9e484fb28d63c999483f5d5188e89b"},
 ]
 docutils = [
     {file = "docutils-0.16-py2.py3-none-any.whl", hash = "sha256:0c5b78adfbf7762415433f5515cd5c9e762339e23369dbe8000d84a4bf4ab3af"},
@@ -772,6 +775,11 @@ markupsafe = [
     {file = "MarkupSafe-1.1.1-cp37-cp37m-manylinux1_x86_64.whl", hash = "sha256:ba59edeaa2fc6114428f1637ffff42da1e311e29382d81b339c1817d37ec93c6"},
     {file = "MarkupSafe-1.1.1-cp37-cp37m-win32.whl", hash = "sha256:b00c1de48212e4cc9603895652c5c410df699856a2853135b3967591e4beebc2"},
     {file = "MarkupSafe-1.1.1-cp37-cp37m-win_amd64.whl", hash = "sha256:9bf40443012702a1d2070043cb6291650a0841ece432556f784f004937f0f32c"},
+    {file = "MarkupSafe-1.1.1-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:6788b695d50a51edb699cb55e35487e430fa21f1ed838122d722e0ff0ac5ba15"},
+    {file = "MarkupSafe-1.1.1-cp38-cp38-manylinux1_i686.whl", hash = "sha256:cdb132fc825c38e1aeec2c8aa9338310d29d337bebbd7baa06889d09a60a1fa2"},
+    {file = "MarkupSafe-1.1.1-cp38-cp38-manylinux1_x86_64.whl", hash = "sha256:13d3144e1e340870b25e7b10b98d779608c02016d5184cfb9927a9f10c689f42"},
+    {file = "MarkupSafe-1.1.1-cp38-cp38-win32.whl", hash = "sha256:596510de112c685489095da617b5bcbbac7dd6384aeebeda4df6025d0256a81b"},
+    {file = "MarkupSafe-1.1.1-cp38-cp38-win_amd64.whl", hash = "sha256:e8313f01ba26fbbe36c7be1966a7b7424942f670f38e666995b88d012765b9be"},
     {file = "MarkupSafe-1.1.1.tar.gz", hash = "sha256:29872e92839765e546828bb7754a68c418d927cd064fd4708fab9fe9c8bb116b"},
 ]
 mccabe = [
@@ -849,6 +857,7 @@ pyyaml = [
     {file = "PyYAML-5.3.tar.gz", hash = "sha256:e9f45bd5b92c7974e59bcd2dcc8631a6b6cc380a904725fce7bc08872e691615"},
 ]
 requests = [
+    {file = "requests-2.23.0-py2.7.egg", hash = "sha256:5d2d0ffbb515f39417009a46c14256291061ac01ba8f875b90cad137de83beb4"},
     {file = "requests-2.23.0-py2.py3-none-any.whl", hash = "sha256:43999036bfa82904b6af1d99e4882b560e5e2c68e5c4b0aa03b655f3d7d73fee"},
     {file = "requests-2.23.0.tar.gz", hash = "sha256:b3f43d496c6daba4493e7c431722aeb7dbc6288f52a6e04e7b6023b0247817e6"},
 ]
diff --git a/pyproject.toml b/pyproject.toml
index 089b9e4..d931e84 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,7 +28,7 @@ semidbm = "^0.5.1"
 
 [tool.poetry.dev-dependencies]
 sphinx-click = "^2.3.1"
-coverage = "^5.0.3"
+coverage = "^5.2.1"
 sphinx-autobuild = "^0.7.1"
 pxml = "^0.2.13"
 green = "^3.1.0"