fix(travis): update yarn caching

nklayman · nklayman · commit da3281991c0c · 2019-07-11T17:32:20.000-07:00
diff --git a/.travis.yml b/.travis.yml
@@ -14,9 +14,7 @@ branches:
     - master
     - /^dependabot/.*$/
 
-cache:
-  directories:
-    - node_modules
+cache: yarn
 
 notifications:
   email:
