docs(license): update copyright year(s) (revdotcom#81)

Co-authored-by: github-actions <[email protected]>

Author: github-actions[bot]

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2018, Rev.com Inc.
+Copyright (c) 2018-2022, Rev.com Inc.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal