update copyright notice

LICENSE

@@ -1,8 +1,9 @@
 The MIT License (MIT)
 
-Copyright (c) 2016-2018 Daniel Oaks
+Copyright (c) 2012-2014 Jeremy Latt
 Copyright (c) 2014-2015 Edmund Huber
-Copyright (c) 2014 Jeremy Latt
+Copyright (c) 2016-2020 Daniel Oaks
+Copyright (c) 2017-2020 Shivaram Lingamneni
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal