chore(travis-ci): cache npm cache directory

hutson · hutson · commit a44d3063b532 · 2017-06-24T21:19:53.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -7,7 +7,8 @@ addons:
       - g++-4.8
 cache:
   directories:
-    - "node_modules"
+    - node_modules
+    - ${HOME}/.npm
   yarn: true
 env:
   global:
