Removed appveyor.xml no longer needed

appveyor.yml

@@ -1,25 +0,0 @@
-platform: x86
-version: '{branch}-{build}'
-environment:
-  matrix:
-    - PYTHON: "C:\\Python36"
-      TOX_ENV: py36
-
-branches:
-  only:
-    - master
-    - /d+\.\d+\.\d+[\w\-]*$/
-
-install:
-  - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
-  - "SET PYTHONPATH=%APPVEYOR_BUILD_FOLDER%"
-  - "SET TOX_TESTENV_PASSENV=HOME HOMEDRIVE HOMEPATH PYTHONPATH USERPROFILE"
-  - "pip install -U tox"
-
-build: false
-skip_tags: true
-test_script:
-  - "tox -e %TOX_ENV%"
-
-cache:
-  - '%LOCALAPPDATA%\pip\cache'