[Doppins] Upgrade dependency @slack/client to 3.1.0

[doppins-bot]

Hi!

A new version was just released of @slack/client, so Doppins has upgraded your project's dependency ranges.

Make sure that it doesn't break anything, and happy merging! :shipit:

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Upgraded @slack/client from 3.0.0 to 3.1.0

Changelog:

Version 3.1.0

• Updates the lib/clients/web/facets/index.js to reference the new facets added in the 3.0.0 update, thanks @ekmartin
• Adds in a reminders client facet
• MemoryDataStore.getUserByEmail now looks at the correct part of the user object for the email, thanks @SimantovYousoufov
• Adds docs and examples for the data store and sending DMs, thanks @PaulAsjes!