actually use the :participating notification type
actually use the :participating notification type

dreampet/gitlab,jirutka/gitlabhq,jirutka/gitlabhq,iiet/iiet-git,iiet/iiet-git,axilleas/gitlabhq,t-zuehlsdorff/gitlabhq,jirutka/gitlabhq,axilleas/gitlabhq,t-zuehlsdorff/gitlabhq,stoplightio/gitlabhq,iiet/iiet-git,dreampet/gitlab,mmkassem/gitlabhq,mmkassem/gitlabhq,t-zuehlsdorff/gitlabhq,axilleas/gitlabhq,axilleas/gitlabhq,stoplightio/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,t-zuehlsdorff/gitlabhq,mmkassem/gitlabhq,jirutka/gitlabhq,iiet/iiet-git,dreampet/gitlab,dreampet/gitlab