updated license

paper.tex

@@ -794,7 +794,7 @@ system. Additionally, it would allow other serious game developers to use the se
 provided by MMT directly. Such an integration could use the Semantic Alliance framework
 \cite{DavJucKoh:safusa12} as its basis and adapt it for the Unreal Engine.
 
-The current implementation is released under the Gnu General Public License and is
+The current implementation is released under the MIT License and is
 available at \url{https://github.com/KWARC/FrameIT}, while the OMDoc/MMT content can be
 found at \url{https://gl.mathhub.info/groups/FrameIT}. As a first step we want to
 stabilize the system and extend the content (game situations and OMDoc/MMT formalizations)