* fixed #7284

Signed-off-by: Nick Chappell <nick@intronic.org>

This commit fixes the module version number in metadata.json so it conforms to the semantic versioning scheme: http://semver.org/spec/v2.0.0.html

Merged in from: https://github.com/Icinga/puppet-icinga2/pull/16

refs #7284 : https://dev.icinga.org/issues/7284