add yarn cache to travis

icebob · icebob · commit 025563c56b38 · 2017-02-15T13:24:45.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,5 +1,6 @@
 language: node_js
 cache:
+  yarn: true
   directories:
   - node_modules
 node_js:
