Adds license to package.json

Author: c4milo

package.json

@@ -4,6 +4,7 @@
     "email": "[email protected]",
     "description" : "Converts xml to json and vice-versa, using node-expat.",
     "repository": "git://github.com/buglabs/node-xml2json.git",
+    "license": "MIT",
     "main": "index",
     "contributors":[
         {"name": "Camilo Aguilar", "email": "[email protected]"}