Updated Changelog

Author: mghoneimy

Changelog.md

@@ -8,6 +8,26 @@ between each release.
 - Refactor the query conversion to string to separate the process of
 constructing a new query and adding a nested subfield
 
+## 1.7:
+
+### Added
+
+- Added ability to set request http method type in client
+- Added Guzzle7 to composer.json
+- Added PHP7.4 to travis test environments
+
+## 1.6.1:
+
+### Changed:
+
+- Removed empty braces added in the selection set when no fields are selected
+
+## 1.6:
+
+### Added:
+
+- Added ability to inject and use PSR-18 compatible HTTP client in sending requests to GraphQL server
+
 ## 1.5:
 
 ### Added