Release 3.1.0

• end does infact return CssElement all the time. fixes #1 (1c87430)

Release 3.0.0

• easier justfile (6cc25f4)
• use envrc for github token (32da2ad)
• justfile (fb46b6b)
• native typehints for everything (309795a)
• exchange rmt with release-it (a352937)
• dockerize and add the lock (5e1a6b7)