copied png image in 2x shown. 
referred image in storyboard shown
but display in tab bar item big shown
can tell me why image not fitting inside tab bar?
404x404 large of image tab bar. images don't scale, need include correct size image. images need 30x30 points. means 30x30 pixels @1x version, 60x60 pixels @2x version, , 90x90 @3x version.
