Bump version to v2.11.0 (open-mmlab#4870)

* add change log for v2.11.0

* fix typo

* version 2.11.0

* fix typo

* to meet the specification of change log

* Update changelog.md

Co-authored-by: Wenwei Zhang <40779233+ZwwWayne@users.noreply.github.com>

Bump to v2.10.0 (open-mmlab#4692)

* bump to v2.10.0

* update other docs

* resolve comments

* resolve comments

Bump to v2.9.0 (open-mmlab#4557)

* bump to v2.9.0

* update

bump to v2.8.0 (open-mmlab#4387)

bump to v2.7.0 (open-mmlab#4205)

* bump to v2.7.0

* update dates

* update version requirements

* rephrase

* resolve comments

Bump to v2.6.0 (open-mmlab#4038)

* bump to v2.6.0

* update version requirements

* Add README.md reference

* Fix README.md

Bump to v2.5.0 (open-mmlab#3879)

* bump to v2.5.0

* update PR

* resolve comments

* clean unnecessary modification

* update bc breaking

* rephrase bc-breaking

* rephrase

install wheel in github action (open-mmlab#3732)

Add metric items for COCO (open-mmlab#3497)

* Add metric iterms

* Fixed metric items

freeze version 2.2.1 (open-mmlab#3266)