Update serenity requirement from 0.10 to 0.11

[dependabot]

Updates the requirements on serenity to permit the latest version.

Release notes

Sourced from serenity's releases.

v0.11.1

This is a light release to fix compilation on https://docs.rs.

Thanks to the following for their contributions:

• @​acdenisSK

Changed

• [misc] Manually specify list of features for docs.rs to build (@​acdenisSK) c:9f11a3f

Changelog

Sourced from serenity's changelog.

[0.11.1] - 2021-04-18

This is a light release to fix compilation on https://docs.rs.

Thanks to the following for their contributions:

• [@​acdenisSK]

Changed

• [misc] Manually specify list of features for docs.rs to build ([@​acdenisSK]) [c:9f11a3f]

[0.11.0] - 2021-04-18

Thanks to the following for their contributions:

• [@​AldanTanneo]
• [@​AngelOnFira]
• [@​AnnikaCodes]
• [@​acdenisSK]
• [@​almeidx]
• [@​Bloectasy]
• [@​ben-brook]
• [@​Chronophylos]
• [@​devtomio]
• [@​drklee3]
• [@​FallenWarrior2k]
• [@​Gentoli]
• [@​GnomedDev]
• [@​gradiuscypher]
• [@​HarmoGlace]
• [@​hybras]
• [@​JellyWX]
• [@​kangalioo]
• [@​Lakelezz]
• [@​Licenser]
• [@​MathyouMB]
• [@​Milo123459]
• [@​mkrasnitski]
• [@​natto1784]
• [@​nickelc]
• [@​pascalharp]
• [@​rasm47]
• [@​Rstar284]
• [@​Some-Dood]
• [@​squili]
• [@​TheBlackfurGuy]
• [@​tylerd008]
• [@​vaporox]
• [@​vicky5124]

... (truncated)

Commits

• c83ba2a Bump to v0.11.1
• 9f11a3f Manually specify list of features for docs.rs to build
• 4fc1b37 Bump to 0.11.0 (#1774)
• fbfe0cf Use str::split_once for parsing webhooks and user tags (#1795)
• 32cb31c Refactor and fix bugs in utils::content_safe
• f5458f1 Move misc::Mention{able} into their own model/mention module
• d245e67 Require setting gateway intents explicitly (#1817)
• 2596927 Remove the Error::Num enum variant (#1847)
• 10410a2 Update methods and properties of Permissions (#1849)
• d3ae156 Fix minor issues with doc comments & examples (#1850)
• Additional commits viewable in compare view

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[dependabot]

Superseded by #22.