3596: Update Copyright year in license.txt r=heinrich5991 a=dragere

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## Checklist

- [ ] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test if it works standalone, system.c especially
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)


Co-authored-by: dragere <hjahn25@gmail.com>
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bors[bot] 2021-02-03 12:47:33 +00:00 committed by GitHub
commit d21f7966b1
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@ -1,6 +1,6 @@
Teeworlds Copyright (C) 2007-2014 Magnus Auvinen
DDRace Copyright (C) 2010-2011 Shereef Marzouk
DDNet Copyright (C) 2013-2020 Dennis Felsing
DDNet Copyright (C) 2013-2021 Dennis Felsing
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages