Add Support for "relative-time" Element

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Please consider adding support for the <relative-time> element.

Example

The relative-time element exists in this repo's latest release page:

$ curl -sL 'https://github.com/ericchiang/pup/releases/latest' | grep -A2 '<relative-time'

  # <relative-time class="no-wrap" prefix="" datetime="2016-07-23T04:49:49Z">
  #   23 Jul 04:49
  # </relative-time>

However, specifying the relative-time element as a selector yields no output:

$ curl -sL 'https://github.com/ericchiang/pup/releases/latest' | pup 'relative-time'

  # [null output]

Thank you for your consideration and...
A big thank you to all contributors, I very much appreciate this tool!