fix minetest license

- https://github.com/minetest/minetest/blob/master/LICENSE.txt
- CC licenses are only used by assets in the default pack

README.md

@@ -965,7 +965,7 @@ _Related: [Groupware](#groupware)_
 - [Legend of the Green Dragon](https://github.com/lotgd/core) - Legend of the Green Dragon is a text-based RPG originally developed by Eric Stevens and JT Traub as a remake of and homage to the classic BBS Door game, Legend of the Red Dragon, by Seth Able Robinson. ([Demo](http://lotgd.net/)) `AGPL-3.0` `PHP`
 - [Lila](https://lichess.org/) - The forever free, adless and open source chess server powering lichess.org, with official iOS and Android client apps. ([Source Code](https://github.com/ornicar/lila)) `AGPL-3.0` `Scala`
 - [Mindustry](https://mindustrygame.github.io/) - Factorio-like tower defense game. Build production chains to gather more resources, and build complex facilities. ([Source Code](https://github.com/Anuken/Mindustry)) `GPL-3.0` `Java`
-- [Minetest](https://www.minetest.net/) - An open source voxel game engine. Play one of our many games, mod a game to your liking, make your own game, or play on a multiplayer server. ([Source Code](https://github.com/minetest/minetest)) `LGPL-2.1/CC-BY-SA-3.0/Other` `C++`
+- [Minetest](https://www.minetest.net/) - An open source voxel game engine. Play one of our many games, mod a game to your liking, make your own game, or play on a multiplayer server. ([Source Code](https://github.com/minetest/minetest)) `LGPL-2.1/MIT/Zlib` `C++`
 - [MTA:SA](https://mtasa.com/) `⚠` - Multi Theft Auto (MTA) is a software project that adds network play functionality to Rockstar North's Grand Theft Auto game series, in which this functionality is not originally found. ([Source Code](https://github.com/multitheftauto/mtasa-blue)) `GPL-3.0` `C++`
 - [Net64+](https://net64-mod.github.io) `⚠` - Net64 aka SM64O allows playing Super Mario 64 in an online multiplayer mode. Net64+ is the official continuation of the program and features an integrated server list. ([Source Code](https://github.com/Tarnadas/net64plus-server/), [Clients](https://github.com/Tarnadas/net64plus/)) `MIT` `Nodejs`
 - [node-virtual-gamepads](https://github.com/jehervy/node-virtual-gamepads) - Turn your smartphone into a game controller, keyboard, or touchpad for a remote Linux OS machine. `MIT` `Nodejs/CoffeScript`