Update CONTRIBUTORS.md (#359)

Rajiv Ranjan Singh

02.21.2020 a6879a80a1d24b4dac203c3f8fa66cb7161228e5

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<li>
  <span class="date">{{ .Date.Format (.Site.Params.dateFormat | default "January 2, 2006" ) }}</span>
  <a class="title" href="{{ .Params.ExternalLink | default .RelPermalink }}">{{ .Title }}</a>
</li>