Merge pull request #146 from sathieu/ruby1.8

Ruby 1.8 compatibility (Agent-side) - fact only. This does not mean that ruby 1.8 or older puppet versions are supported by this module.

lib/facter/alert_manager_running.rb

@@ -1,6 +1,6 @@
 require 'puppet'
 
-service = Puppet::Type.type(:service).new(name: 'alert_manager')
+service = Puppet::Type.type(:service).new(:name => 'alert_manager') # rubocop:disable Style/HashSyntax
 
 Facter.add('prometheus_alert_manager_running') do
   setcode do