Update CHANGELOG for 8.6.8, 8.5.12, et al.
Update CHANGELOG for 8.6.8, 8.5.12, et al.

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openwide-java/gitlabhq,jirutka/gitlabhq,axilleas/gitlabhq,LUMC/gitlabhq,screenpages/gitlabhq,t-zuehlsdorff/gitlabhq,SVArago/gitlabhq,icedwater/gitlabhq,mmkassem/gitlabhq,iiet/iiet-git,larryli/gitlabhq,htve/GitlabForChinese,htve/GitlabForChinese,martijnvermaat/gitlabhq,t-zuehlsdorff/gitlabhq,allysonbarros/gitlabhq,larryli/gitlabhq,darkrasid/gitlabhq,darkrasid/gitlabhq,dreampet/gitlab,screenpages/gitlabhq,shinexiao/gitlabhq,screenpages/gitlabhq,daiyu/gitlab-zh,martijnvermaat/gitlabhq,allysonbarros/gitlabhq,mr-dxdy/gitlabhq,mmkassem/gitlabhq,LUMC/gitlabhq,dreampet/gitlab,allysonbarros/gitlabhq,allysonbarros/gitlabhq,stoplightio/gitlabhq,dreampet/gitlab,axilleas/gitlabhq,SVArago/gitlabhq,iiet/iiet-git,dplarson/gitlabhq,SVArago/gitlabhq,icedwater/gitlabhq,icedwater/gitlabhq,shinexiao/gitlabhq,dreampet/gitlab,LUMC/gitlabhq,martijnvermaat/gitlabhq,mr-dxdy/gitlabhq,mr-dxdy/gitlabhq,mmkassem/gitlabhq,iiet/iiet-git,daiyu/gitlab-zh,openwide-java/gitlabhq,dplarson/gitlabhq,iiet/iiet-git,t-zuehlsdorff/gitlabhq,martijnvermaat/gitlabhq,axilleas/gitlabhq,larryli/gitlabhq,dplarson/gitlabhq,jirutka/gitlabhq,Soullivaneuh/gitlabhq,stoplightio/gitlabhq,Soullivaneuh/gitlabhq,darkrasid/gitlabhq,openwide-java/gitlabhq,LUMC/gitlabhq,screenpages/gitlabhq,larryli/gitlabhq,htve/GitlabForChinese,icedwater/gitlabhq,SVArago/gitlabhq,dplarson/gitlabhq,shinexiao/gitlabhq,mr-dxdy/gitlabhq,t-zuehlsdorff/gitlabhq,mmkassem/gitlabhq,axilleas/gitlabhq,jirutka/gitlabhq,Soullivaneuh/gitlabhq,htve/GitlabForChinese,daiyu/gitlab-zh,jirutka/gitlabhq,daiyu/gitlab-zh,openwide-java/gitlabhq,stoplightio/gitlabhq,Soullivaneuh/gitlabhq,shinexiao/gitlabhq,darkrasid/gitlabhq,stoplightio/gitlabhq