Add unreleased section to CHANGELOG

Author: pluma

CHANGELOG.md

@@ -14,6 +14,8 @@ This driver uses semantic versioning:
 - A change in the major version (e.g. 1.Y.Z -> 2.0.0) indicates _breaking_
   changes that require changes in your code to upgrade.
 
+## [unreleased]
+
 ## [7.6.0] - 2021-10-20
 
 ### Added
@@ -1225,6 +1227,7 @@ For a detailed list of changes between pre-release versions of v7 see the
 
   Graph methods now only return the relevant part of the response body.
 
+[unreleased]: https://github.com/arangodb/arangojs/compare/v7.6.0...HEAD
 [7.6.0]: https://github.com/arangodb/arangojs/compare/v7.5.0...v7.6.0
 [7.5.0]: https://github.com/arangodb/arangojs/compare/v7.4.0...v7.5.0
 [7.4.0]: https://github.com/arangodb/arangojs/compare/v7.3.0...v7.4.0