Bump eris from `19257d5` to `a7db53b`

Created by: dependabot-preview[bot]

Bumps eris from 19257d5 to a7db53b.

Commits

• a7db53b Add nitro boost messages and guild properties (#495)
• 6fef5a6 Add Shard#presence to typings (#498)
• 43a91d0 Fix Guild#getBans() typings (#500)
• f200fda Expose old type in channelUpdate event (#499)
• a46f8f5 0.10.0
• bb887e4 Downgrade unknown message type error to warning
• 836a041 Code linting
• 3a500d8 Update LICENSE year
• 3f35fb8 Code cleanup & formatting (#488)
• ae2fac1 Ignore duplicate spaces between command args (#485)
• Additional commits viewable in compare view

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