Update changelog

CHANGELOG.md

@@ -7,7 +7,23 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
-...
+### Changed
+- [breaking-change] Renamed `is_busy()` and `is_running()` methods `busy()` and `running()`
+  due to Rust naming conventions.
+- Implement trait from [`rtcc`] crate.
+- Changed `get_datetime()` and `set_datetime()` parameter from `DateTime`
+  to `chrono::NaiveDateTime`.
+
+### Added
+- Methods to set and get date and time using `chrono::NaiveDate` and `chrono::NaiveTime`:
+    - `get_time()`
+    - `set_time()`
+    - `get_date()`
+    - `set_date()`
+- [`chrono`] (through [`rtcc`]) dependency.
+
+### Removed
+- `DateTime` data structure was replaced by `chrono::NaiveDateTime`.
 
 ## [0.2.0] - 2018-11-16
 
@@ -22,5 +38,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 This is the initial release to crates.io. All changes will be documented in
 this CHANGELOG.
 
+[`chrono`]: https://crates.io/crates/chrono
+[`rtcc`]: https://crates.io/crates/rtcc
+
 [Unreleased]: https://github.com/eldruin/ds323x-rs/compare/v0.2.0...HEAD
 [0.2.0]: https://github.com/eldruin/ds323x-rs/compare/v0.1.0...v0.2.0