Exposing license information according to bower format

Strange enough, licensing information is present on master, but all the releases (tags) lack it.
angular-ui · mkotsur · Jul 24, 2015 · Jul 24, 2015 · cbda674fb292c50c510b6b2dfdd70d3e0c145a95
commit cbda674fb292c50c510b6b2dfdd70d3e0c145a95
diff --git a/bower.json b/bower.json
@@ -5,5 +5,6 @@
   "dependencies": {
     "angular": ">=1.2.x",
     "jquery-ui": ">=1.9"
-  }
+  },
+  "license": "MIT"
 }