Update package.json (#302)

Add license to package.json

Author: abramjstamper

package.json

@@ -7,6 +7,7 @@
   "jsnext:main": "es/index.js",
   "author": "Jeremy Ayerst",
   "homepage": "https://github.com/jerairrest/react-chartjs-2",
+  "license" : "MIT" ,
   "repository": {
     "type": "git",
     "url": "https://github.com/jerairrest/react-chartjs-2.git"