[tor-bugs] #27761 [Core Tor/Tor]: check-changes: check that bugfix versions have 3 numbers in them

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#27761: check-changes: check that bugfix versions have 3 numbers in them
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     Reporter:  teor          |      Owner:  teor
         Type:  enhancement   |     Status:  assigned
     Priority:  Medium        |  Milestone:  Tor: 0.3.5.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  fast-fix
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 I tried to modify lintChanges.py to check for bugfixes against future
 versions. But then I realised that we backport bugfixes.

 So I salvaged the version parsing code into a new check.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27761>
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