Update README.md：缺少一个逗号

README.md

@@ -19,7 +19,7 @@
     },
     "^/ds_github_monkey_script.js$": {
       "proxy": "https://raw.githubusercontent.com/docmirror/dev-sidecar/scripts/github/monkey.js",
-      "response": { "headers": { "content-type": "application/javascript; charset=utf-8" } }
+      "response": { "headers": { "content-type": "application/javascript; charset=utf-8" } },
       "cacheDays": 7,
       "desc": "代理到DS仓库中的Github油猴脚本，并设置响应头 `content-type: 'application/javascript; charset=utf-8'`，同时缓存7天。"
     }