v7.0.0

This version fixes two errors in test due to minor package updates. It also upgrades dependencies to be compatible with GatsbyJS sites.

• chai@^4.1.2
• css-loader@^0.28.7
• enzyme@^2.9.1
• eslint@^4.7.0
• eslint-plugin-react@^7.3.0
• normalize.css@^7.0.0
• postcss-cssnext@^3.0.2
• postcss-import@^10.0.0
• postcss-loader@^2.0.6
• postcss-url@^7.1.2
• react@^15.6.1
• react-test-renderer@^15.6.1
• style-loader@^0.18.2
• webpack-dashboard@^1.0.0-5