Clarify license

Author: Lukáš Marek

package.json

@@ -8,7 +8,7 @@
     "Lukáš Marek <[email protected]>"
   ],
   "description": "Angular.js wrapper for Dan Grosmann's bootstrap date range picker (https://github.com/dangrossman/bootstrap-daterangepicker).",
-  "license": "Apache",
+  "license": "MIT",
   "private": false,
   "devDependencies": {
     "grunt": "~0.4.1",