planning for next major version publish

[devoncarew]

Some brief planning for publishing the next major version (from conversations on https://github.com/dart-lang/lints/pull/208 and https://github.com/dart-lang/lints/issues/205):

• [ ] rev package:lints to the next stable version (5.0.0); publish
  • https://github.com/dart-lang/lints/pull/210
• [ ] update package:flutter_lints to remove several const related lints; rev the dep on package:lints to 5.0.0; rev to the next major version; publish
  • https://github.com/flutter/packages/pull/7688
• [ ] add unintended_html_in_doc_comment to package:lints, rev to 5.1.0, publish