[tor-bugs] #32704 [Core Tor/Tor]: Port changelog tools to python 3

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#32704: Port changelog tools to python 3
--------------------------+------------------------------------
 Reporter:  nickm         |          Owner:  nickm
     Type:  defect        |         Status:  accepted
 Priority:  Medium        |      Milestone:  Tor: 0.4.3.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:                |  Actual Points:  0
Parent ID:                |         Points:  0
 Reviewer:                |        Sponsor:
--------------------------+------------------------------------
Changes (by nickm):

 * status:  new => accepted
 * owner:  (none) => nickm
 * actualpoints:   => 0


Comment:

 Branch is `ticket32704` with PR at
 https://github.com/nmathewson/tor/pull/new/ticket32704 .

 I've tested these changes by using them with python2 and python3 to
 regenerate the changelogs for the current pending releases.  The output
 looks correct.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32704#comment:1>
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