refactor LICENSE.txt to make github even more happier (#8826)

* refactor LICENSE.txt to make github even more happier

* Fixing up nits

LICENSE

@@ -1,6 +1,6 @@
-The MIT License (MIT)
+MIT License
 
-Copyright (c) Microsoft Corporation. All rights reserved.
+Copyright (c) 2016 Microsoft Corporation
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal