Add restriction for single characters in branch name
Add restriction for single characters in branch name

mmkassem/gitlabhq,LUMC/gitlabhq,jrjang/gitlab-ce,darkrasid/gitlabhq,koreamic/gitlabhq,htve/GitlabForChinese,dreampet/gitlab,mr-dxdy/gitlabhq,mr-dxdy/gitlabhq,jirutka/gitlabhq,screenpages/gitlabhq,screenpages/gitlabhq,dplarson/gitlabhq,dwrensha/gitlabhq,dplarson/gitlabhq,mr-dxdy/gitlabhq,daiyu/gitlab-zh,Datacom/gitlabhq,openwide-java/gitlabhq,dwrensha/gitlabhq,htve/GitlabForChinese,Soullivaneuh/gitlabhq,ttasanen/gitlabhq,icedwater/gitlabhq,icedwater/gitlabhq,LUMC/gitlabhq,iiet/iiet-git,darkrasid/gitlabhq,axilleas/gitlabhq,mrb/gitlabhq,ttasanen/gitlabhq,duduribeiro/gitlabhq,Datacom/gitlabhq,SVArago/gitlabhq,mmkassem/gitlabhq,jrjang/gitlab-ce,stoplightio/gitlabhq,dplarson/gitlabhq,screenpages/gitlabhq,martijnvermaat/gitlabhq,shinexiao/gitlabhq,dwrensha/gitlabhq,axilleas/gitlabhq,mrb/gitlabhq,allysonbarros/gitlabhq,iiet/iiet-git,Soullivaneuh/gitlabhq,openwide-java/gitlabhq,shinexiao/gitlabhq,stoplightio/gitlabhq,stoplightio/gitlabhq,t-zuehlsdorff/gitlabhq,Soullivaneuh/gitlabhq,larryli/gitlabhq,dplarson/gitlabhq,LUMC/gitlabhq,jrjang/gitlabhq,ttasanen/gitlabhq,dreampet/gitlab,shinexiao/gitlabhq,dwrensha/gitlabhq,jrjang/gitlabhq,larryli/gitlabhq,allysonbarros/gitlabhq,mrb/gitlabhq,ttasanen/gitlabhq,larryli/gitlabhq,LUMC/gitlabhq,jirutka/gitlabhq,martijnvermaat/gitlabhq,yatish27/gitlabhq,allysonbarros/gitlabhq,daiyu/gitlab-zh,jrjang/gitlabhq,darkrasid/gitlabhq,icedwater/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,iiet/iiet-git,icedwater/gitlabhq,jirutka/gitlabhq,jrjang/gitlab-ce,htve/GitlabForChinese,Soullivaneuh/gitlabhq,SVArago/gitlabhq,duduribeiro/gitlabhq,SVArago/gitlabhq,larryli/gitlabhq,axilleas/gitlabhq,mmkassem/gitlabhq,yatish27/gitlabhq,allysonbarros/gitlabhq,daiyu/gitlab-zh,shinexiao/gitlabhq,screenpages/gitlabhq,duduribeiro/gitlabhq,Datacom/gitlabhq,daiyu/gitlab-zh,jrjang/gitlabhq,jirutka/gitlabhq,SVArago/gitlabhq,duduribeiro/gitlabhq,htve/GitlabForChinese,t-zuehlsdorff/gitlabhq,openwide-java/gitlabhq,Datacom/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,mmkassem/gitlabhq,koreamic/gitlabhq,t-zuehlsdorff/gitlabhq,koreamic/gitlabhq,mrb/gitlabhq,yatish27/gitlabhq,jrjang/gitlab-ce,martijnvermaat/gitlabhq,t-zuehlsdorff/gitlabhq,openwide-java/gitlabhq,martijnvermaat/gitlabhq,mr-dxdy/gitlabhq,koreamic/gitlabhq,dreampet/gitlab,darkrasid/gitlabhq,yatish27/gitlabhq