Add circle.yml to use ruby-2.1.5
Add circle.yml to use ruby-2.1.5

asonas/idobata-hooks,asonas/idobata-hooks,asonas/idobata-hooks,idobata/idobata-hooks,1syo/idobata-hooks,kirikiriyamama/idobata-hooks,kirikiriyamama/idobata-hooks,1syo/idobata-hooks,idobata/idobata-hooks,1syo/idobata-hooks,kirikiriyamama/idobata-hooks,idobata/idobata-hooks