Remove appveyor

README.md

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 add-trailing-comma

appveyor.yml

-environment:
-    matrix:
-        - TOXENV: py27
-        - TOXENV: py37
-
-install:
-    - "SET PATH=C:\\Python37;C:\\Python37\\Scripts;%PATH%"
-    - pip install tox
-
-# Not a C# project
-build: false
-
-test_script: tox
-
-cache:
-  - '%LOCALAPPDATA%\pip\cache'
-  - '%USERPROFILE%\.cache\pre-commit'