Merge pull request #606 from alanpoulain/fix-travis-yarn

Install yarn in before_install

Author: soyuka

.travis.yml

@@ -1,4 +1,6 @@
-language: node
+language: node_js
+node_js:
+  - 'stable'
 
 cache:
   yarn: true
@@ -7,6 +9,10 @@ env:
   global:
     secure: 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
 
+before_install:
+  - curl -o- -L https://yarnpkg.com/install.sh | bash
+  - export PATH="$HOME/.yarn/bin:$PATH"
+
 install:
   - pip install --user proselint
   - cp .proselintrc ~