Merge pull request #855 from mboersma/update-readme

docs(README.md): add notice of final release and maintenance mode

Merge pull request #849 from mboersma/release-v2.17

docs(*): updates/changelog for v2.17.0 release

Merge pull request #837 from mboersma/release-v2.16

docs(*): updates/changelog for v2.16.0 release

Merge pull request #821 from mboersma/release-v2.15.0

docs(*): updates/changelog for v2.15.0 release

Merge pull request #808 from mboersma/release-v2.14

docs(*): updates/changelog for v2.14.0 release

Merge pull request #787 from mboersma/release-v2.13

docs(*): updates/changelog for v2.13.0 release

Merge pull request #760 from mboersma/release-v2.12

docs(*): updates/changelog for v2.12.0 release

docs(*): updates/changelog for v2.11.0 release (#721)

docs(*): update versions to v2.10.0 and add changelog (#680)

* docs(*): update versions to v2.10.0 and add changelog

docs(*): update versions to v2.9.1 and add changelog

A couple of fixes were also applied to the release document to reflect some small nuances in the
release cycle.