Update LICENSE

Michael Hahn · web-flow · commit 342d084e4c1b · 2019-07-17T13:33:08.000-07:00
diff --git a/LICENSE b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2016-present Slack Technologies, Inc.
+Copyright (c) 2019 Slack Technologies, 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
