[Buildbot] #2856: update MAINTAINERS.txt

[Buildbot trac]

#2856: update MAINTAINERS.txt
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Reporter:  dustin  |       Owner:  dustin
    Type:  task    |      Status:  new
Priority:  major   |   Milestone:  botherders
 Version:  0.8.9   |  Resolution:
Keywords:          |
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Comment (by dustin):

 https://github.com/buildbot/buildbot/pull/1251

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Ticket URL: <http://trac.buildbot.net/ticket/2856#comment:3>
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