Update changelog

Author: faern

CHANGELOG.md

@@ -5,21 +5,27 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+
+
+## [0.2.0] - 2019-04-01
 ### Added
 - Add support for specifying service dependencies when creating a service.
 - A `ServiceExitCode::NO_ERROR` constant for easy access to the success value.
 - Add `Service::start` for starting services programmatically.
+- Add `Service::query_config` for getting the config of the service.
 
 ### Changed
 - Changed `service_control_handler::register` to accept an `FnMut` rather than just an `Fn` for the
   `event_handler` closure.
 - Upgrade to Rust 2018. This raises the minimum required Rust version to 1.31.0.
+- Replace error-chain error library with err-derive. So all error types are changed.
+- Change `ServiceType` implementation to use the `bitflags!` macro.
 
 ### Fixed
 - Fix invalid pointer manipulations in service creation routine in ServiceManager.
 - Fix memory leak in `service_control_handler::register` that did not release `event_handler` in
   the case of an error.
-
+- Treat FFI return code 0 as error, instead of treating 1 as success.
 
 
 ## [0.1.0] - 2018-06-04