fix(travis): force npm v3 minimum for older version of node

TheLarkInn · TheLarkInn · commit ea7528396871 · 2016-10-27T12:17:19.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -23,6 +23,7 @@ script: npm run travis
 env:
   - NO_WATCH_TESTS=1
 
+before_install: if [[ `npm -v` != 3* ]]; then npm i -g npm@3; fi
 install:
   - bash ./ci/travis-install.sh
 after_success:
