update Node to 6.x LTS (#1228)
The 4.x branch [entered maintenance](https://github.com/nodejs/LTS#lts-schedule1) on 1 April.
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		| @@ -5,8 +5,6 @@ notifications: | |||||||
|   email: false |   email: false | ||||||
|  |  | ||||||
| env: | env: | ||||||
|   matrix: |  | ||||||
|     - TRAVIS_NODE_VERSION="4" |  | ||||||
|   global: |   global: | ||||||
|     - LOCAL_DOMAIN=cb6e6126.ngrok.io |     - LOCAL_DOMAIN=cb6e6126.ngrok.io | ||||||
|     - LOCAL_HTTPS=true |     - LOCAL_HTTPS=true | ||||||
| @@ -28,8 +26,7 @@ before_install: | |||||||
|   - sudo apt-get -qq update |   - sudo apt-get -qq update | ||||||
|   - sudo apt-get -qq install g++-4.8 |   - sudo apt-get -qq install g++-4.8 | ||||||
| install: | install: | ||||||
|   - nvm install $TRAVIS_NODE_VERSION |   - nvm install | ||||||
|   - npm install -g npm@3 |  | ||||||
|   - npm install -g yarn |   - npm install -g yarn | ||||||
|   - bundle install |   - bundle install | ||||||
|   - yarn install |   - yarn install | ||||||
|   | |||||||
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