Add license type: MIT is a NOTICE license am: ea764afff8 am: fd44500f60 am: 56e7c16757

Change-Id: Ic8ba287628b95dcfbf5e5ed1332d8091e311b653
diff --git a/METADATA b/METADATA
index 67e629f..59680f8 100644
--- a/METADATA
+++ b/METADATA
@@ -8,5 +8,6 @@
     value: "https://github.com/KhronosGroup/SPIRV-Headers.git"
   }
   version: "d5b2e1255f706ce1f88812217e9a554f299848af"
+  license_type: NOTICE
   last_upgrade_date { year: 2018 month: 12 day: 17 }
 }