Set up cargo-release to automate crates.io releases

Author: phil-opp

Cargo.toml

@@ -12,3 +12,10 @@ repository = "https://github.com/phil-opp/volatile"
 
 [features]
 const_fn = []
+
+[package.metadata.release]
+no-dev-version = true
+pre-release-replacements = [
+    { file="Changelog.md", search="# Unreleased", replace="# Unreleased\n\n# {{version}} – {{date}}", exactly=1 },
+]
+pre-release-commit-message = "Release version {{version}}"