Migration guide for v6 -> v7 ?

[olsonpm]

Welcome! Please use this template for reporting bugs or requesting features. For questions about using Workbox, the best place to ask is Stack Overflow, tagged with [workbox]: https://stackoverflow.com/questions/ask?tags=workbox

Library Affected:
workbox-sw, workbox-build, etc.

• v5 workbox-* libraries (we depend on 13 of them)

Browser & Platform:
E.g. Google Chrome v51.0.1 for Android, or "all browsers".

• all browsers

Issue or Feature Request Description:
Your request here.

• Is there a migration guide for v6->v7 ? Or are there breaking changes listed somewhere ?

When reporting bugs, please include relevant JavaScript Console logs and links to public URLs at which the issue could be reproduced.