chore: change license copyright date

BobrImperator · BobrImperator · commit 66f54014abf8 · 2022-09-19T11:03:00.000+02:00
diff --git a/LICENSE.md b/LICENSE.md
@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2017-2018 Mainmatter GmbH and contributors
+Copyright (c) 2017-2022 Mainmatter GmbH and contributors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 
