Refs fibercrypto#342, more regresion to python2 to make travis happy

appveyor.yml

@@ -19,8 +19,8 @@ install:
       C:\msys64\usr\bin\bash --login -c "pacman -S --noconfirm mingw-w64-x86_64-clang"
       C:\msys64\usr\bin\bash --login -c "pacman -S --noconfirm mingw-w64-x86_64-protobuf-c"
       C:\msys64\usr\bin\bash --login -c "pacman -S --noconfirm mingw-w64-x86_64-go"
-      C:\msys64\usr\bin\bash --login -c "pacman -S --noconfirm mingw-w64-x86_64-python3-pip"
       C:\msys64\usr\bin\bash --login -c "pacman -S --noconfirm tree"
+      choco install python3 --params "/InstallDir:C:\python3.8"
 
   # ARM toolchain
   - if not exist "gcc-arm-none-eabi.zip" curl -L -o gcc-arm-none-eabi.zip https://launchpad.net/gcc-arm-embedded/5.0/5-2016-q3-update/+download/gcc-arm-none-eabi-5_4-2016q3-20160926-win32.zip
@@ -33,8 +33,6 @@ install:
   # python stuff
   - pip --version
   - which pip
-  - which pip3
-  - /mingw64/bin/pip3 --version
   - pip install yamllint
 
   # sudo stuff