Cache node_modules in Travis CI

DanielRuf · FagnerMartinsBrack · commit e288a7321e2d · 2018-05-29T21:07:19.000+10:00
Closes js-cookiegh-444.
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,9 @@
 language: node_js
 node_js:
   - '6'
+cache:
+  directories:
+    - node_modules
 # Only use grunt-ci for commits pushed to this repo. Fall back to regular test
 # for pull requests (as secure variables won't be exposed there).
 script:
