message: try fix sharp build step
diff: language: node_js
  -node_js:
  - - "7"
  +node_js: stable
  +before_install:
  + - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
  + - sudo apt-get -qq update
  + - sudo apt-get -qq install g++-4.8
  +env:
  + - CXX=g++-4.8
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