hyphenationFactor doesn't work

[gh552]

NSMutableParagraphStyle hyphenationFactor doesn't work with NantesLabel

To Reproduce
Steps to reproduce the behavior:

1. set hyphenationFactor to 1 - example:
   let label = NantesLabel (frame: .zero)
   label.delegate = self
   label.numberOfLines = 0
   let attrString = NSMutableAttributedString(string: longText)
   let style = NSMutableParagraphStyle ()
   style.hyphenationFactor = 1.0
   let fullRange = NSMakeRange(0, attrString.length)
   attrString.addAttributes([NSMutableAttributedString.Key.paragraphStyle : style], range: fullRange)
   label.attributedText = attrString
2. the resulted label does not have hyphenation.
   If I set the label to UILabel, hyphenation works.

Expected behavior
The line brake for the long text is done with the hyphenation