Switch to Rust 2021

Author: andy128k

CHANGELOG.md

@@ -5,6 +5,7 @@
 ## 2.0.3 - 2023-03-27
 
 - Upgrade `quick_xml` to `0.28` [`#146`](https://github.com/rust-syndication/rss/pull/146)
+- Switch to Rust 2021 [`#147`](https://github.com/rust-syndication/rss/pull/147)
 
 ## 2.0.2 - 2023-01-14
 

Cargo.toml

@@ -9,7 +9,7 @@ license = "MIT/Apache-2.0"
 readme = "README.md"
 keywords = ["rss", "feed", "parser", "parsing"]
 include = ["src/*", "Cargo.toml", "LICENSE-MIT", "LICENSE-APACHE", "README.md"]
-edition = "2018"
+edition = "2021"
 
 [package.metadata.docs.rs]
 all-features = false