Prepare release 0.3.0 (#12)

* Update pubspec

* Update changelog

CHANGELOG.md

@@ -1,3 +1,10 @@
+## 0.3.0
+
+- Reworked `registerFactory` methods used on `RequestManager`, `EventManager` and `PipelineConfigurator` to be extension methods (#9)
+- The built-in `EventHandler`, `RequestHandler` and `PipelineBehavior` are now immutable (#9)
+- Only 1 pipeline behavior will be returned if the same instance is registered multiple times using `register` and `registerGeneric` methods (#10)
+- `RequestManager.unregister` added (#11)
+
 ## 0.2.0
 
 - `RequestManager.send` now only accepts a single generic argument, `TResponse`, which is the type of the response body. The `TRequest` type argument has been removed. The type of the Response will be inferred based on the given `Request<Response>` (#3)

pubspec.yaml

@@ -2,8 +2,12 @@ name: dart_mediator
 description: >
   A simple yet highly configurable Mediator implementation
   that allows sending requests and publishing events.
-version: 0.2.0
+version: 0.3.0
 repository: https://github.com/MatthiWare/mediator.dart
+issue_tracker: https://github.com/MatthiWare/mediator.dart/issues
+
+topics:
+  - mediator
 
 environment:
   sdk: '>=3.0.0 <4.0.0'