Add missing integrity attributes (#520)

Piotr Orzechowski

23.24.2021 501a5bcbc49d0c67383905faeb08e6a71f3f0906

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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>