Merge branch 'rust-2021' into 'master'

Migrate to edition 2021

See merge request mkjeldsen/commitmsgfmt!77

Author: commonquail

Cargo.toml

@@ -8,7 +8,7 @@ homepage = "https://gitlab.com/mkjeldsen/commitmsgfmt"
 repository = "https://gitlab.com/mkjeldsen/commitmsgfmt"
 readme = "README.md"
 license = "Apache-2.0"
-edition = "2018"
+edition = "2021"
 rust-version = "1.63.0"
 
 [dependencies]