[wp-meta] [Making WordPress.org] #2978: Add new Polyglots team mentors to /announce list

[Making WordPress.org]

#2978: Add new Polyglots team mentors to /announce list
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 Reporter:  SergeyBiryukov  |      Owner:
     Type:  task            |     Status:  new
 Priority:  normal          |  Milestone:
Component:  Slack & IRC     |   Keywords:  has-patch
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 https://make.wordpress.org/polyglots/2017/06/26/notes-from-the-polyglots-
 chats-on-june-21/
 > We officially welcome @sergey, @tobifjellner to the team mentors and
 welcome back @coachbirgit

 cc @pento

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Ticket URL: <https://meta.trac.wordpress.org/ticket/2978>
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