Do not cache the local node_modules

.travis.yml

@@ -6,7 +6,6 @@ addons:
   firefox: latest
 cache:
   directories:
-    - node_modules
     - $HOME/.npm
 env:
   matrix:

appveyor.yml

@@ -12,7 +12,7 @@ environment:
 
 # build cache to preserve files/folders between builds
 cache:
-  - node_modules # NPM packages
+  - '%APPDATA%\npm-cache'  # npm cache
 
 # scripts that run after cloning repository
 install: