docs: mark v1.6.0 in history

Signed-off-by: Jan Kowalleck <[email protected]>

Author: jkowalleck

HISTORY.md

@@ -4,6 +4,8 @@ All notable changes to this project will be documented in this file.
 
 ## unreleased
 
+## 1.6.0 - 2022-11-12
+
 * Added
   * When CLI option `--flatten-components=true` is set, then the property [`cdx:npm:package:bundled`](https://github.com/CycloneDX/cyclonedx-property-taxonomy/blob/main/cdx/npm.md) might be added ([#311] via [#310])
 * Misc