Remove non-standard text at beginning of license

Because of the non-standard text at the beginning of the license, it cannot be automatically recognized by tools such as Licensee.
2017-07-23 12:31:09 +02:00 · 2017-07-23 12:31:09 +02:00 · 78d27be243
--- a/LICENSE.txt
+++ b/LICENSE.txt
@ -1,6 +1,3 @@
-
-TypeScript Grammar 
-
 Copyright (c) Microsoft Corporation
 All rights reserved.