Notify service on config changes

The config package did not have a notify-relationship to the service
package. This patch fixes this, causing postfix to get reloaded and
picking up the new config upon changes.

Patch provided by Martijn Heemels (see #8).

Fixes #7.

CHANGELOG.md

@@ -5,6 +5,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+- Notify service on config changes, causing it to reload postfix to pick up the
+  changes ([#7])
 
 ## Release [1.0.1] - 2018-09-27
 This release fixes support for systems where postfix is not installed, and
@@ -72,6 +75,7 @@ First release as oxc-postfix, now requires Puppet 4.9
 [0.2.0]: https://github.com/oxc/puppet-postfix/compare/v0.1.0...v0.2.0
 [0.1.0]: https://github.com/oxc/puppet-postfix/compare/v0.0.1...v0.1.0
 [0.0.1]: https://github.com/oxc/puppet-postfix/compare/f7d8b52...v0.0.1
+[#7]: https://github.com/oxc/puppet-postfix/issues/7
 [#6]: https://github.com/oxc/puppet-postfix/pull/6
 [#5]: https://github.com/oxc/puppet-postfix/issues/5
 [#4]: https://github.com/oxc/puppet-postfix/issues/4

manifests/init.pp

@@ -93,5 +93,5 @@
 ) {
   Class { '::postfix::package':  }
   -> Class { '::postfix::config': }
-  -> Class { '::postfix::service': }
+  ~> Class { '::postfix::service': }
 }

spec/classes/postfix_spec.rb

@@ -8,6 +8,10 @@
 
     it { is_expected.to contain_class('postfix::package') }
 
-    it { is_expected.to contain_class('postfix::service').that_requires('Class[postfix::package]') }
+    it { is_expected.to contain_class('postfix::config').that_requires('Class[postfix::package]') }
+
+    it { is_expected.to contain_class('postfix::config').that_notifies('Class[postfix::service]') }
+
+    it { is_expected.to contain_class('postfix::service').that_requires('Class[postfix::config]') }
   end
 end