LICENSE: Specify BSD 2-Clause (#3133)

kevinji · bestander · commit a371bc2e851c · 2017-05-13T00:26:34.000+01:00
diff --git a/LICENSE b/LICENSE
@@ -1,4 +1,4 @@
-BSD License
+BSD 2-Clause License
 
 For Yarn software
 
