New feature - DestroyOnSize

This is a new feature-release for a new option called: destroyOnSize.

Usage

import heightify from 'heightify'

heightify({
  element: '.testClass',
  destroyOnSize: 500 // This will flush heightify settings below the specified height. in this case 500px
)}

• This feature is especially good for mobile devices, as cards almost never needs the same height when are just rendered in a list below each other.

fixed #15