Bump idna from 2.8 to 2.10

Bumps [idna](https://github.com/kjd/idna) from 2.8 to 2.10.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v2.8...v2.10)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

requirements.txt

@@ -6,7 +6,7 @@ bs4==0.0.1
 certifi==2019.11.28
 chardet==3.0.4
 discord.py==1.4.1
-idna==2.8
+idna==2.10
 lavalink==3.1.2
 multidict==4.7.4
 mysql-connector==2.2.9