update URL for TorDNSEL
https://metrics.torproject.org/collector.html#exit-lists
links to https://dist.torproject.org/tordnsel/ which has a version from 2007
lets replace the url with (from 2016-05-04): https://gitweb.torproject.org/tordnsel.git/tree/README
link Tor check to https://gitweb.torproject.org/check.git
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