message: Exclude python3 from appveyor installation
diff: @@ -64,7 +64,7 @@ cache:
  install:
  - cmd: |-
  - cinst python3 winflexbison
  + cinst winflexbison
  set FLEX_PATH=%CHOCO_DIR%\lib\winflexbison\tools
  if exist "%FLEX_PATH%\win_flex.exe" ( cd %FLEX_PATH% && ren win_flex.exe flex.exe )
  if exist "%LLVM_HOME%\bin\" set NONEEDLLVM=rem
  