chore(deps): update dependency discord.py to v2.3.1

This MR contains the following updates:

Package	Update	Change
discord.py	minor	==2.1.1 -> ==2.3.1

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Release Notes

Rapptz/discord.py

v2.3.1

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v2.3.0

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v2.2.3

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v2.2.2

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v2.2.1

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v2.2.0

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Configuration

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♻ Rebasing: Whenever MR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this MR and you won't be reminded about this update again.

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