remove node modules from appveyor cache

appveyor.yml

@@ -28,6 +28,6 @@ test_script:
 matrix:
   fast_finish: false
 
-cache:
+# cache:
-  - C:\Users\appveyor\AppData\Roaming\npm-cache -> package.json     # npm cache
+#   - C:\Users\appveyor\AppData\Roaming\npm-cache -> package.json     # npm cache
-  - node_modules -> package.json                                    # local npm modules
+#   - node_modules -> package.json                                    # local npm modules