[tests] use version-sync, add doc(html_root_url)

Author: stbuehler

Cargo.toml

@@ -24,3 +24,6 @@ log = "0.3.8"
 libc = "0.2.24"
 ws2_32-sys = "0.2.1"
 winapi = "0.2.5"
+
+[dev-dependencies]
+version-sync = "0.5"

src/lib.rs

@@ -1,3 +1,4 @@
+#![doc(html_root_url = "https://docs.rs/async-dnssd/0.4.0")]
 //! # Asynchronous wrapper for DNS-SD C libraries
 //!
 //! Interesting entry points:

tests/version-numbers.rs

@@ -0,0 +1,12 @@
+#[macro_use]
+extern crate version_sync;
+
+#[test]
+fn test_readme_deps() {
+	assert_markdown_deps_updated!("README.md");
+}
+
+#[test]
+fn test_html_root_url() {
+	assert_html_root_url_updated!("src/lib.rs");
+}