add peerDependency for grunt

package.json

@@ -25,22 +25,24 @@
       "type": "MIT"
     }
   ],
+  "dependencies": {
+    "svg-merge": "0.0.0",
+    "q": "~1.0.0"
+  },
   "devDependencies": {
     "grunt-contrib-jshint": "~0.2.0",
     "grunt-contrib-nodeunit": "~0.1.2",
     "grunt-contrib-clean": "~0.4.0",
-    "grunt": "~0.4.0rc2",
+    "grunt": "~0.4.0",
     "load-grunt-tasks": "~0.2.0",
     "jshint-stylish": "~0.1.3",
     "grunt-simple-mocha": "~0.4.0",
     "chai": "latest"
   },
+  "peerDependencies": {
+    "grunt": "~0.4.0"
+  },
   "scripts": {
     "test": "grunt test"
-  },
-  "dependencies": {
-    "svg-merge": "0.0.0",
-    "lodash": "~2.4.1",
-    "q": "~1.0.0"
   }
 }