Update stable version in repo from 0.5.1 to 0.5.6

[GermanBluefox]

Think about update stable version to 0.5.6

Version: stable=0.5.1 (224 days old) => latest=0.5.6 (15 days old) Installs: stable=2214 (71.7%), latest=123 (3.98%), total=3088 Click to edit