Ignore greeting if some slack group mentioned#87

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nikitasakau wants to merge 2 commits intomasterfrom

fix-bug-with-group-mention

Commits on Oct 2, 2020

Corrected regexp in messageHasMentions in order to ignore messages with @here, @channel, etc
Nikita
committed
Added test for greeting feature for case when slack group mentioned
Nikita
committed