chore: Update to edition 2021

Muscraft · Muscraft · commit fba7bfef0f0e · 2023-11-08T13:35:03.000-07:00
diff --git a/Cargo.toml b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "annotate-snippets"
 version = "0.9.2"
-edition = "2018"
+edition = "2021"
 authors = ["Zibi Braniecki <gandalf@mozilla.com>"]
 description = "Library for building code annotations"
 license = "Apache-2.0/MIT"
