[Merge] lp:~phablet-team/history-service/notify-group-changes-in-conversation into lp:history-service/staging

[Gustavo Pichorim Boiko]

Review: Approve

Looks good now!
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https://code.launchpad.net/~phablet-team/history-service/notify-group-changes-in-conversation/+merge/308428
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