Update rust edition (#19)

* chore: update to Rust 2021 edition * chore: Prepare v4.0.0
KevinGimbel · Nov 15, 2023 · 4bfc591 · 4bfc591
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## v4.0.0
+
+- use Rust Edition 2021 (upgrade from 2018)
+
 ## v3.3.0
 
 - refactor `make_toc` function for easier third-party integration [#13](https://github.com/KevinGimbel/mktoc/issues/13)
@@ -22,4 +26,4 @@
 ## v3.0.0
 
 - Implement JSON settings
-- Add build for GitHub Binary releases
+- Add build for GitHub Binary releases
diff --git a/Cargo.toml b/Cargo.toml
@@ -2,9 +2,9 @@
 name = "mktoc"
 description = "Generate Table of Contents from Markdown files"
 license = "MIT"
-version = "3.3.0"
+version = "4.0.0"
 authors = ["Kevin Gimbel <hallo@kevingimbel.com>"]
-edition = "2018"
+edition = "2021"
 repository = "https://github.com/kevingimbel/mktoc"
 exclude = [".github", "assets", "helpers", "tests", ".gitignore", "Makefile"]
 rust-version = "1.64.0"