v0.6.0

• Travis CI
  • Add Yarn cache
  • Add Node.js v8.x.x
• Update dependencies
  • pidusage from v1.1.0 to v1.1.6
  • socket.io from v1.5.1 to v2.0.3
• Update dev dependencies
  • coveralls from v2.11.15 to v2.13.1
  • eslint from v3.10.2 to v4.3.0
  • eslint-config-airbnb-base from v10.0.1 to v11.3.1
  • eslint-plugin-import from v2.2.0 to v2.7.0
  • jest from v17.0.3 to v20.0.4
• Update example dependencies
  • hapi from v15.2.0 to v16.5.0
  • request from v2.78.0 to v2.81.0