rollback travis to precise dist

sokra · sokra · commit b06d69f10561 · 2017-08-09T10:52:54.000+02:00
because trusty image have old yarn version
diff --git a/.travis.yml b/.travis.yml
@@ -1,4 +1,5 @@
 sudo: false
+dist: precise
 language: node_js
 
 branches:
