Merge tag 'v4.5.5-LESS' of github.com:nicoespeon/inuit.css into nicoespeon-v4.5.5-LESS
Add units to .icon-text__icon
Add units to .icon-text__icon and helpers

# By Peter Wilson
# Via Peter Wilson
* commit '06fbdf168c056f9cc403d4d0c2a5f226aa53dd34':
  Add units to .icon-text__icon
update readme