update modulefile to newest stdlib

Author: Tim Meusel

Modulefile

@@ -10,5 +10,5 @@ project_page 'https://github.com/stephenrjohnson/puppetlabs-puppet'
 dependency 'puppetlabs/inifile', '>= 1.0.0'
 dependency 'puppetlabs/apache', '>= 1.0.1'
 dependency 'puppetlabs/puppetdb', '>= 2.0.0'
-dependency 'puppetlabs/stdlib', '>= 3.0.0'
+dependency 'puppetlabs/stdlib', '>= 4.5.1'
 dependency 'jfryman/nginx', '>= 0.1.1'