[tor-bugs] #30059 [Core Tor/Chutney]: Update chutney's README

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#30059: Update chutney's README
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  teor
     Type:  defect                               |         Status:
                                                 |  merge_ready
 Priority:  Medium                               |      Milestone:
Component:  Core Tor/Chutney                     |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  doc, chutney-ci, network-team-       |  Actual Points:  0.2
  roadmap-2019-Q1Q2                              |
Parent ID:  #29729                               |         Points:  0.2
 Reviewer:  nickm                                |        Sponsor:
                                                 |  Sponsor19
-------------------------------------------------+-------------------------
Changes (by nickm):

 * status:  needs_review => merge_ready


Comment:

 LGTM though I think another branch I just reviewed changes
 CHUTNEY_START_TIME to 120.

 Maybe we should stop mentioning default values inline, and instead have
 their documentation be automagically generated somehow.  We seem to change
 them a lot.  (That could be another ticket though.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30059#comment:2>
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