Update CHANGELOG.md for 10.4.5
Update CHANGELOG.md for 10.4.5

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