chore: Use 2021 edition

Stranger6667 · Stranger6667 · commit e4715c9a3350 · 2022-09-26T13:57:01.000+02:00
diff --git a/bindings/python/Cargo.toml b/bindings/python/Cargo.toml
@@ -2,7 +2,7 @@
 name = "css-inline-python"
 version = "0.8.3"
 authors = ["Dmitry Dygalo <dadygalo@gmail.com>"]
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
diff --git a/bindings/wasm/Cargo.toml b/bindings/wasm/Cargo.toml
@@ -2,7 +2,7 @@
 name = "css-inline-wasm"
 version = "0.8.1"
 authors = ["Dmitry Dygalo <dadygalo@gmail.com>"]
-edition = "2018"
+edition = "2021"
 readme = "README.md"
 description = "A WASM package for inlining CSS into HTML documents"
 repository = "https://github.com/Stranger6667/css-inline"
diff --git a/css-inline/Cargo.toml b/css-inline/Cargo.toml
@@ -2,7 +2,7 @@
 name = "css-inline"
 version = "0.8.2"
 authors = ["Dmitry Dygalo <dadygalo@gmail.com>"]
-edition = "2018"
+edition = "2021"
 license = "MIT"
 readme = "../README.md"
 description = "A crate for inlining CSS into 'style' HTML attributes."
