Merge pull request #1104 from bettio/add-v0.6-to-security

Add v0.6 to SECURITY.md

These changes are made under both the "Apache 2.0" and the "GNU Lesser General
Public License 2.1 or later" license terms (dual license).

SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later

SECURITY.md

@@ -10,6 +10,7 @@
 
 | Version | Supported          |
 | ------- | ------------------ |
+| 0.6.x   | :white_check_mark: |
 | < 0.5   | :x:                |
 <!-- TODO: add first supported version: | 1.0.x   | :white_check_mark: | -->