enable pip cache in appveyor build

thijstriemstra · xavfernandez · commit 78f14f9b18d2 · 2018-10-15T15:46:58.000+02:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -19,5 +19,8 @@ install:
 
 build: off
 
+cache:
+  - '%LOCALAPPDATA%\pip\Cache'
+
 test_script:
   - "%PYTHON%\\Scripts\\tox.exe -e py"
