Save the pip cache across builds. Ref pypa/setuptools#1279.

jaraco · jaraco · commit a8f66602f224 · 2018-02-20T08:45:54.000-05:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -14,6 +14,9 @@ install:
 
 build: off
 
+cache:
+  - '%LOCALAPPDATA%\pip\Cache'
+
 test_script:
   - "python -m pip install tox tox-venv"
   - "tox"
