Add thin bottom border to header
Add thin bottom border to header

See discussion at #329.

CocoaPods/cocoadocs.org,jogu/cocoadocs.org,briancroom/cocoadocs.org,CocoaPods/cocoadocs.org,briancroom/cocoadocs.org,neonichu/cocoadocs.org,jogu/cocoadocs.org,jogu/cocoadocs.org,briancroom/cocoadocs.org,neonichu/cocoadocs.org,neonichu/cocoadocs.org,CocoaPods/cocoadocs.org