title: sed replace special characters followed by newline
body: <p>I have the following file</p>
  
  <pre><code>"user_id1": "184767",
          "timeStamp": "2017-03-08 19:55:25.000"
      },
      {
          "user_id1": "146364",
          "timeStamp": "2017-03-12 23:48:48.000"
      },
  ]
  </code></pre>
  
  <p>I want to replace all instances of <code>},]</code> with <code>}]</code></p>