Update license

LICENSE → LICENSE.md

@@ -1,6 +1,6 @@
-MIT License
+The MIT License (MIT)
 
-Copyright (c) 2019 Tomislav Bacinger
+Copyright (c) 2019-2020 Tomislav Bacinger
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal