upgrade font-awesome & metadata crates to edition 2021

Author: syphar

crates/font-awesome-as-a-crate/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "font-awesome-as-a-crate"
 version = "0.3.0"
-edition = "2018"
+edition = "2021"
 license = "CC-BY-4.0 AND MIT"
 description = "Font Awesome Free, packaged as a crate"
 repository = "https://github.com/rust-lang/docs.rs"

crates/metadata/Cargo.toml

@@ -2,7 +2,7 @@
 name = "docsrs-metadata"
 version = "0.1.0"
 authors = ["Joshua Nelson <[email protected]>", "The Rust Project Developers"]
-edition = "2018"
+edition = "2021"
 license = "MIT"
 repository = "https://github.com/rust-lang/docs.rs"
 description = "Document crates the same way docs.rs would"