fix rtd install step

Mr-Milk · Mr-Milk · commit 2a3585a27739 · 2021-05-18T20:12:25.000+08:00
diff --git a/readthedocs.yaml b/readthedocs.yaml
@@ -11,6 +11,4 @@ sphinx:
 python:
   version: 3.8
   install:
-    - requirements: requirements.txt
-    - method: pip
-      path: .
+    - requirements: requirements.txt
