[ci] swith appveyor py35 to py38
Merge branch 'master' into feature/pytest
[ci] avoid building twice on appveyor
[ci] remove custom path for win64 on appveyor
[ci] switch appveyor to pytest
.appveyor.yml: do force waf to use msvc 14 (tests/ wont compile on 10)
.appveyor.yml: force cl.exe path on 64-bit platforms
.appveyor.yml: no msvc hint for waf
.appveyor.yml: remove quotes, try using mingw on amd64
.appveyor.yml: clean before building python wheel
.appveyor.yml: fix indentation
.appveyor.yml: use powershell to upload and install wheel
.appveyor.yml: simplify, add test_script, move requirements to install
.appveyor.yml: set path first, remove extension
.appveyor.yml: add default PATH
.appveyor.yml: remove PATH setting
.appveyor.yml: remove python 3.4, add 3.6 and 3.7, remove PATH_EXTRAS
.appveyor.yml: upgrade pip first, always use python -m pip
.appveyor.yml: remove def output, do not try to build python-aubio against libaubio
.appveyor.yml: print def file to check its content