let Travis CI to cache node_modules

honzajavorek · honzajavorek · commit cec3b73505ac · 2018-03-19T17:34:54.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,3 +2,6 @@ language: node_js
 node_js:
     - "6"
     - "8"
+cache:
+    directories:
+        - "node_modules"
