Clarify licensing
The license in the repository points to GPLv3.
During a discussion on the gnome #rust channel, it sounded like this was mostly due to just copying the license from the other apps you work on rather than an intentional decision. If that is the case would you consider re-licensing to the same terms of the other gtk-rs bindings (MIT license)?
I know the README clearly states that the crate is not currently maintained, but this is even more important now while the number of authors is small and before the repository gets forked.
As far as I can see from the history this would require approval (for instance replying to this issue) only from @haecker-felix and @bilelmoussaoui