Use yarn to install dependecies

dweber019 · dweber019 · commit 115846a2d016 · 2017-09-04T09:18:55.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,7 @@ language: node_js
 node_js:
   - "6.9.1"
 install:
-  - npm install
+  - yarn install
 script:
   - npm test
   - npm start -- build
