Update dependency coveralls to v3.0.9

Author: renovate-bot

package.json

@@ -84,7 +84,7 @@
     "babel-plugin-istanbul": "5.0.1",
     "babel-register": "6.26.0",
     "browser-sync": "2.24.7",
-    "coveralls": "3.0.2",
+    "coveralls": "3.0.9",
     "cross-env": "5.2.0",
     "eslint": "5.6.0",
     "eslint-config-standard": "12.0.0",