pubdate not valid for html5

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+The `pubdate` attribute is not valid for modern HTML(5).
+
+The [h-entry microformat](http://microformats.org/wiki/h-entry) describes
+an alternative way to achieve the same thing: a `dt-published` class name.
+
+Patch: <https://github.com/jmtd/ikiwiki/commit/a137103d3004cc8cec42459205684ec48af0ca11>
+[[!tag patch]]
+[[!template id=gitbranch branch=jon/html5-no-pubdate-attribute author="[[Jon]]"]]
+*—[[Jon]], 2020-10-06*