Bump discord-py from 2.6.4 to 2.7.1

Bumps [discord-py](https://github.com/Rapptz/discord.py) from 2.6.4 to 2.7.1.
- [Commits](Rapptz/discord.py@v2.6.4...v2.7.1)

---
updated-dependencies:
- dependency-name: discord-py
  dependency-version: 2.7.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]