[REEF-872] Add Dhruv to the REEF committer list on website
[REEF-872] Add Dhruv to the REEF committer list on website

This addressed the issue by
  * adding dhruv to the website

JIRA:
  [REEF-872](https://issues.apache.org/jira/browse/REEF-872)

Pull Request:
  This closes #588

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