v8.0.0-canary.19

Minor Changes

• Introduce env to next.config.js for build-time configuration: #6212

Patches

• Remove publish test results for azure pipelines: 230ae52
• Invalidate cache for link[preload] in DEV: #6183
• Remove route event in componentWillUnmount: #6196
• Updated readme with improved info about next/link and next/router: #6197
• Remove 'acorn' dependency: #6193
• Only compile /_error when /_error is needed: #6192
• [examples] Update react jss example: #6198
• Remove extraneous benchmark dependency: #6222
• Remove Unneeded _error import: #6224

Credits

Huge thanks to @dav-is, @giuseppeg, @Sklpcc, @cenoura, @grushetsky, @HenriBeck, and @alexandernanberg for helping!