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:
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  email: false
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					  email: false
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env:
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					env:
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  matrix:
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    - TRAVIS_NODE_VERSION="4"
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  global:
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					  global:
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    - LOCAL_DOMAIN=cb6e6126.ngrok.io
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					    - LOCAL_DOMAIN=cb6e6126.ngrok.io
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    - LOCAL_HTTPS=true
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					    - LOCAL_HTTPS=true
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@@ -28,8 +26,7 @@ before_install:
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  - sudo apt-get -qq update
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					  - sudo apt-get -qq update
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  - sudo apt-get -qq install g++-4.8
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					  - sudo apt-get -qq install g++-4.8
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install:
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					install:
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  - nvm install $TRAVIS_NODE_VERSION
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					  - nvm install
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  - npm install -g npm@3
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  - npm install -g yarn
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					  - npm install -g yarn
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  - bundle install
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					  - bundle install
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  - yarn install
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					  - yarn install
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