Update changelog (microsoft#436)

* Update changelog

Signed-off-by: Jinbo Wang <jinbwan@microsoft.com>

* Update changelog per review

Bump version to 0.12.2 (microsoft#406)

Bump version to 0.12.1 (microsoft#397)

version 0.12.0

Update CHANGELOG for 0.11.0 release (microsoft#348)

Update the supported feature list (microsoft#323)

Bump version to 0.9.0 (microsoft#292)

Signed-off-by: Jinbo Wang <jinbwan@microsoft.com>

Version 0.8.0

add more items in changelog (microsoft#253)

* 0.7.0

* add missing items in change log.

Tag 0.6.0