Update CHANGELOG.md for 10.1.2
Update CHANGELOG.md for 10.1.2

[ci skip]
dreampet/gitlab,jirutka/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,axilleas/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,jirutka/gitlabhq,axilleas/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,dreampet/gitlab,axilleas/gitlabhq,iiet/iiet-git,stoplightio/gitlabhq,stoplightio/gitlabhq,jirutka/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,iiet/iiet-git,iiet/iiet-git,mmkassem/gitlabhq,dreampet/gitlab