appveyor: Upgrade pip with 'python -m pip'

This reportedly works around pypa/pip#5240
bdarnell · Apr 21, 2018 · 2ebd007 · 2ebd007
1 parent a843bc9
commit 2ebd007
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/appveyor.yml b/appveyor.yml
@@ -48,7 +48,7 @@ install:
 
   # Upgrade to the latest version of pip to avoid it displaying warnings
   # about it being out of date.
-  - "pip install --disable-pip-version-check --user --upgrade pip"
+  - "python -m pip install --disable-pip-version-check --user --upgrade pip"
 
   - "pip install tox wheel"