Prepare v2.2.1 release.

Signed-off-by: Mior Muhammad Zaki <crynobone@gmail.com>

CHANGELOG-2.x.md

@@ -2,6 +2,22 @@
 
 This changelog references the relevant changes (bug and security fixes) done to `laravie/codex`.
 
+## 2.2.1
+
+Released: 2018-04-04
+
+### Added
+
+* Added `Laravie\Codex\Support\MultipartRequest::stream()` method.
+
+### Changes
+
+* Normalize given `$path` when constructing `Laravie\Codex\Endpoint`.
+* `Laravie\Codex\Sanitizer` should be able to lazy load casts object.
+* Improves tests and docblocks.
+* Use `Laravie\Codex\Contracts\Endpoint` as typehint instead of `Laravie\Codex\Endpoint` whenever possible.
+* Mark `Laravie\Codex\Support\HttpClient::convertUriToEndpoint()` as `final`.
+
 ## 2.2.0
 
 Released: 2018-03-14