Fix copyright in license

[Tyrrrz]

• The copyright you replaced was in regards to the LGPL, not your project. The license is copyrighted by FSF.
• Added copyright info on top, per example provided for GPL (https://www.gnu.org/licenses/gpl-howto.en.html)

Also consider adding the text of the original GPL, because LGPL acts as an extension and not a standalone license. Source: https://www.gnu.org/licenses/gpl-howto.html (ctrl+f 'You should also include')