env:
  - CXX=g++-4.8
language: node_js
node_js:
  - "8"
  - "10"
addons:
  apt:
    sources:
    - ubuntu-toolchain-r-test
    packages:
    - gcc-4.8
    - g++-4.8
install: npm install
before_install:
- npm install -g npm
- npm install -g greenkeeper-lockfile@1
before_script: greenkeeper-lockfile-update
after_script: greenkeeper-lockfile-upload

env:
  - CXX=g++-4.8
language: node_js
node_js:
  - "8"
  - "10"
addons:
  apt:
    sources:
    - ubuntu-toolchain-r-test
    packages:
    - gcc-4.8
    - g++-4.8
install: npm install
before_install:
- npm install -g npm@6.1.0
- npm install -g greenkeeper-lockfile@1
before_script: greenkeeper-lockfile-update
after_script: greenkeeper-lockfile-upload

Make Travis npm version explicit at 6.1.0
Make Travis npm version explicit at 6.1.0
