main.cpp still as GNU General Public License

[miquelcampos]

Hello!
I see that long ago in this commit 5b35024 the license was changed to MIT but looks like this file still with the old one.

Is it possible to change it? I am using the QjsonModel python version in mGear but some users have concerns when they found this file license.

Thanks!

[dridk]

Yes!... could you make me a PR ? Otherwise I will forget