fixed correct license field

Author: kazu69

package.json

@@ -14,12 +14,7 @@
   "bugs": {
     "url": "https://github.com/kazu69/grunt-htmlhint-inline/issues"
   },
-  "licenses": [
-    {
-      "type": "MIT",
-      "url": "https://github.com/kazu69/grunt-htmlhint-inline/blob/master/LICENSE"
-    }
-  ],
+   "license": "MIT",
   "engines": {
     "node": ">= 0.8.0"
   },
@@ -36,7 +31,7 @@
   },
   "peerDependencies": {
     "grunt": ">=0.4.0"
-  },
+    },
   "keywords": [
     "gruntplugin",
     "lint",