Limit build status image to master branch [ci skip]
Limit build status image to master branch [ci skip]

theplant/rack-oauth2-server,anerhan/rack-oauth2-server,TheNeatCompany/rack-oauth2-server,technekes/rack-oauth2-server,TheNeatCompany/rack-oauth2-server,TheNeatCompany/rack-oauth2-server,assaf/rack-oauth2-server,technekes/rack-oauth2-server,anerhan/rack-oauth2-server,anerhan/rack-oauth2-server,theplant/rack-oauth2-server,theplant/rack-oauth2-server,assaf/rack-oauth2-server