Let's try with no cache?

dfreeman · dfreeman · commit d847708f5faa · 2018-04-14T22:02:07.000-04:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -21,7 +21,7 @@ install:
   - yarn --ignore-optional
 
 cache:
- - "%LOCALAPPDATA%\\Yarn"
+#  - "%LOCALAPPDATA%\\Yarn"
 
 # Post-install test scripts.
 test_script:
