License change proposal to address https://github.com/randrew/phantomstyle#license

[twardoch]

In https://github.com/randrew/phantomstyle#license you’ve stated:

I would prefer to give it a more permissive license, or the same license that the official code Qt has, which allows commercial projects to use the code without LGPL restrictions if they have a Qt license. However, I don't know how to do this, and I don't have time at the moment to figure it out. Please contact me or open a ticket if you can help with this. The PhantomStyle code originally started as a copy-and-paste of the Fusion code, but nearly none of the Fusion code remains at this point (just some stuff for drawing MDI window decorations and QDial.)

I have implemented this intention in #12

Just accept this PR, and you’ll give users of your project the same licensing terms as the users of Qt have, which, I believe, is your intention.