fix random travis build error
fix random travis build error

finnlabs/omniauth-openid-connect,hhorikawa/omniauth-openid-connect,IDme/omniauth-openid-connect,ahoernecke/omniauth-openid-connect,cyclone-project/omniauth-openid-connect,zkwentz/omniauth-openid-connect,engineyard/omniauth-openid-connect,jjbohn/omniauth-openid-connect,shishirmk/omniauth-openid-connect,wader/omniauth-openid-connect,stormsilver/omniauth-openid-connect