Update changelog for M8

Change-Id: I8e50b811f3798c6f4cd21b8196f71502e8d0aea8
Merge "Update changelog for M8" into cm-11.0
Merge remote-tracking branch 'CM/cm-11.0' into cm-11.0

Conflicts:
	CHANGELOG.mkdn

Change-Id: Ib43b42752d4b0d65ba83e2365f45a41c3dfe3c97