azure pipelines removed python3.6 on windows

Author: asottile

azure-pipelines.yml

@@ -23,7 +23,7 @@ jobs:
     wheel_tags: true
 - template: job--python-tox.yml@asottile
   parameters:
-    toxenvs: [py36]
+    toxenvs: [py37]
     os: windows
     architectures: [x64, x86]
     wheel_tags: true