message: build: remove npm command from travis ci
diff: @@ -63,11 +63,11 @@ before_install:
  - git clone https://github.com/creationix/nvm.git ~/.nvm
  - source ~/.nvm/nvm.sh
  - nvm install $TRAVIS_NODE_VERSION
  - - npm install npm@4.6.1
  + # - npm install npm@4.6.1
  - mv node_modules npm
  - export PATH="./node_modules/.bin/:$PATH"
  # output versions
  - - npm/.bin/npm --version
  + # - npm/.bin/npm --version
  - yarn --version
  - node --version
  - if [[ $TRAVIS_OS_NAME == "linux" ]];
  