chore: Add version-sync to dev-dependencies.

Makes version bumps a little easier.

Cargo.toml

@@ -18,6 +18,7 @@ louds-rs = "0.6"
 criterion = "0.2"
 rand = "0.6"
 lazy_static = "1.3"
+version-sync = "0.9"
 
 [[bench]]
 name = "bench"

src/lib.rs

@@ -1,3 +1,4 @@
+#![doc(html_root_url = "https://docs.rs/trie-rs/0.3.0")]
 #![forbid(missing_docs)]
 //! Memory efficient trie (prefix tree) and map library based on LOUDS.
 //!
@@ -22,7 +23,7 @@
 //!
 //! ```toml
 //! [dependencies]
-//! trie-rs = "0.1"  # NOTE: Replace to latest minor version.
+//! trie-rs = "0.3"
 //! ```
 //!
 //! ## Usage Overview

tests/version-numbers.rs

@@ -0,0 +1,9 @@
+#[test]
+fn test_readme_deps() {
+    version_sync::assert_markdown_deps_updated!("README.md");
+}
+
+#[test]
+fn test_html_root_url() {
+    version_sync::assert_html_root_url_updated!("src/lib.rs");
+}