fixed warning when running rake
fixed warning when running rake

Kriechi/simplecov-html,varyform/simplecov-html,seanwalbran/simplecov-html,varyform/simplecov-html,Kriechi/simplecov-html,rdiazv/simplecov-html,colszowka/simplecov-html,darylrobbins/simplecov-bamboo,colszowka/simplecov-html,matthew342/simplecov-badge,jreinert/simplecov-badge,Kriechi/simplecov-html,envato/simplecov-html,colszowka/simplecov-html,seanwalbran/simplecov-html,envato/simplecov-html,rdiazv/simplecov-html