add support for utteranc.es (#205)

Shreyansh Khajanchi

21.03.2019 9b47893b348c4c3f45b102d5c3b556da8336031e

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{{- if and (isset .Site.Params.utteranc "repo") (not (eq .Site.Params.utteranc.repo "" )) (eq (.Params.disable_comments | default false) false) -}}
<script src="https://utteranc.es/client.js"
  repo= "{{ .Site.Params.utteranc.repo }}"
  issue-term="{{ default "title" .Site.Params.utteranc.issueTerm }}"
  theme="{{ default "github-light" .Site.Params.utteranc.theme }}"
  crossorigin="anonymous"
  async>
</script>
{{- end -}}