Use Python3.5 (well, PIP) on AppVeyor to solve deprecation warnings

appveyor.yml

@@ -11,11 +11,39 @@ branches:
     - /dev-travis.+/
 
 
+# We need a more up to date pip because Python 2.7 is EOL soon
+init:
+  - set PATH=C:\Python35\Scripts;%PATH%
+
+
+install:
+  - ps: if (($env:CONFIGURATION) -eq "Debug" -And ($env:coverage) -eq "1" ) { pip --disable-pip-version-check install codecov }
+  - ps: if (($env:CONFIGURATION) -eq "Debug" -And ($env:coverage) -eq "1" ) { .\misc\installOpenCppCoverage.ps1 }
+
+
+before_build:
+  - set CXXFLAGS=%additional_flags%
+  # Indirection because appveyor doesn't handle multiline batch scripts properly
+  # https://stackoverflow.com/questions/37627248/how-to-split-a-command-over-multiple-lines-in-appveyor-yml/37647169#37647169
+  # https://help.appveyor.com/discussions/questions/3888-multi-line-cmd-or-powershell-warning-ignore
+  - cmd: .\misc\appveyorBuildConfigurationScript.bat
+
+
+# build with MSBuild
+build:
+  project: Build\Catch2.sln             # path to Visual Studio solution or project
+  parallel: true                        # enable MSBuild parallel builds
+  verbosity: normal                     # MSBuild verbosity level {quiet|minimal|normal|detailed}
+
+test_script:
+  - set CTEST_OUTPUT_ON_FAILURE=1
+  - cmd: .\misc\appveyorTestRunScript.bat
+
+
 # Sadly we cannot use the standard "dimensions" based approach towards
 # specifying the different builds, as there is no way to add one-offs
 # builds afterwards. This means that we will painfully specify each
 # build explicitly.
-
 environment:
   matrix:
     - FLAVOR: VS 2019 x64 Debug
@@ -101,28 +129,3 @@ environment:
       additional_flags: "/permissive- /std:c++latest"
       platform: x64
       configuration: Debug
-
-
-install:
-  - ps: if (($env:CONFIGURATION) -eq "Debug" -And ($env:coverage) -eq "1" ) { python -m pip --disable-pip-version-check install codecov }
-  - ps: if (($env:CONFIGURATION) -eq "Debug" -And ($env:coverage) -eq "1" ) { .\misc\installOpenCppCoverage.ps1 }
-
-
-#Cmake will autodetect the compiler, but we set the arch
-before_build:
-  - set CXXFLAGS=%additional_flags%
-  # Indirection because appveyor doesn't handle multiline batch scripts properly
-  # https://stackoverflow.com/questions/37627248/how-to-split-a-command-over-multiple-lines-in-appveyor-yml/37647169#37647169
-  # https://help.appveyor.com/discussions/questions/3888-multi-line-cmd-or-powershell-warning-ignore
-  - cmd: .\misc\appveyorBuildConfigurationScript.bat
-
-
-# build with MSBuild
-build:
-  project: Build\Catch2.sln             # path to Visual Studio solution or project
-  parallel: true                        # enable MSBuild parallel builds
-  verbosity: normal                     # MSBuild verbosity level {quiet|minimal|normal|detailed}
-
-test_script:
-  - set CTEST_OUTPUT_ON_FAILURE=1
-  - cmd: .\misc\appveyorTestRunScript.bat