[Core] Adding changelog for 0.3.0 (#237)

Author: Nyholm

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Change Log
 
+## 0.3.0
+
+### Added
+
+- Requests can now be streamed
+- Streamable request accepts iterable alongside string, callable, resource
+- Support for getting credentials from Web Identity or OpenID Connect Federation. (`WebIdentityProvider`)
+
+### Changed
+
+- Rename namespace `Signers` into `Signer`.
+
 ## 0.2.0
 
 ### Added
@@ -8,15 +20,12 @@
 - Methods `AwsClient::cloudFormation()`, `AwsClient::lambda()`, `AwsClient::sns()`
 - Protected methods `Result::registerPrefetch()` and `Result::unregisterPrefetch()`
 - Timeout parameter to `InstanceProvider::__construct()`
-- Requests can now be streamed
-- Streamable request accepts iterable alongside string, callable, resource
 
 ### Changed
 
 - Removed `AwsClient` and replaced it with `AwsClientFactory`
 - Class `AsyncAws\Core\Signer\Request` is marked as internal
 - Make sure behavior of calling `Result::resolve()` is consistent
-- Rename namespace `Signers` into `Signer`.
 
 ## 0.1.0