6.0.0-canary.2

Minor Changes

• Allow BUILD_ID to be set using generateBuildId: #3873
• Add Router method to execute custom logic before popstate events: #3956
• Make sure hot-self-accept-loader cleans up the route correctly with custom extensions: #4092

Patches

• Better support React 16.3.0: #4090
• Fix serve command: #3989
• Upgrade Next in with-firebase-hosting: c07cf5e
• Match externals ending in .js not everything with .js: #4091

Credits

Huge thanks to @craigmcnamara, @gcpantazis, @oliviertassinari and @jonjamz for helping!