Include support for Email API

CHANGELOG.md

@@ -1,16 +1,24 @@
-# Change Log of `infobip-api-php-client`
+# Change Log of `Infobip`
 
 All notable changes to the library will be documented in this file.
 
 The format of the file is based on [Keep a Changelog](http://keepachangelog.com/) and this library adheres to [Semantic Versioning](http://semver.org/) as mentioned in [README.md][readme] file.
 
+## [ [3.1.0](https://github.com/infobip/infobip-api-php-client/releases/tag/3.1.0) ] - 2021-11-19
+
+### Added
+- Support for [Infobip Email API](https://www.infobip.com/docs/api#channels/email)
+
+### Changed
+- Update Guzzle HTTP client version from 6.5 to 7.3
+
 ## [ [3.0.0](https://github.com/infobip/infobip-api-php-client/releases/tag/3.0.0) ] - 2021-03-23
 
-🎉 **NEW Major Version of `infobip-api-php-client`.**
+🎉 **NEW Major Version of `Infobip`.**
 
 ⚠️ **IMPORTANT NOTE:** This release contains breaking changes!
 
-In this release, the infobip-api-php-client library is vastly changed and modernized. It is auto-generated and completely different from the previous version, so we do not provide an upgrade guide from 2.x to 3.x because such a document will be a similar size as the library itself.
+In this release, the `Infobip` library is vastly changed and modernized. It is auto-generated and completely different from the previous version, so we do not provide an upgrade guide from 2.x to 3.x because such a document will be a similar size as the library itself.
 
 ### Added
 - Support for async execution