Add content.json dependency

package.json

@@ -10,10 +10,11 @@
     "hexo-generator-archive": "^0.1.4",
     "hexo-generator-category": "^0.1.3",
     "hexo-generator-index": "^0.2.0",
+    "hexo-generator-json-content": "^2.1.2",
     "hexo-generator-tag": "^0.2.0",
     "hexo-renderer-ejs": "^0.2.0",
-    "hexo-renderer-stylus": "^0.3.1",
     "hexo-renderer-marked": "^0.2.10",
+    "hexo-renderer-stylus": "^0.3.1",
     "hexo-server": "^0.2.0"
   }
-}
+}