Header subheader shorthand element missing className='sub header'

[levithomason]

Steps

1. Create a <Header content='Test' subheader={<span>My subheader</span>} />

Expected Result

The span should be formatted as a sub header.

Actual Result

The span has noclassName so it is formatted as part of the main header content. The Header.create() method needs to add className: 'sub header'.

Version

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Testcase

http://codepen.io/levithomason/pen/eBgdrp