Add docs html root url

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ds323x"
-version = "0.3.1"
+version = "0.3.1" # remember to update html_root_url
 authors = ["Diego Barrios Romero <eldruin@gmail.com>"]
 repository = "https://github.com/eldruin/ds323x-rs"
 license = "MIT OR Apache-2.0"

src/lib.rs

@@ -386,6 +386,7 @@
 //! rtc.set_alarm1_hms(time).unwrap();
 //! ```
 
+#![doc(html_root_url = "https://docs.rs/ds323x/0.3.1")]
 #![deny(unsafe_code, missing_docs)]
 #![no_std]