These don't need to be all PowerShell

Author: dahlia

appveyor.yml

@@ -24,13 +24,12 @@ init:
 - "ECHO %PYTHON%"
 - ps: "ls C:/Python*"
 install:
-- ps: >
-    git -C $env:APPVEYOR_BUILD_FOLDER submodule update --init;
-    (new-object net.webclient).DownloadFile('https://bootstrap.pypa.io/get-pip.py', 'C:/get-pip.py');
-    "$env:PYTHON"\python.exe C:/get-pip.py;
-    "$env:PYTHON"\Scripts\pip.exe --version;
-    "$env:PYTHON"\Scripts\pip.exe install wheel;
-    "$env:PYTHON"\Scripts\pip.exe install -e .
+- git -C %PPVEYOR_BUILD_FOLDER% submodule update --init
+- ps: (new-object net.webclient).DownloadFile('https://bootstrap.pypa.io/get-pip.py', 'C:/get-pip.py')
+- %PYTHON%\python.exe C:/get-pip.py
+- %PYTHON%\Scripts\pip.exe --version
+- %PYTHON%\Scripts\pip.exe install wheel
+- %PYTHON%\Scripts\pip.exe install -e .
 build: false
 test_script:
 - "dir \"C:\\Program Files (x86)\""