add basic tests

manifests/init.pp

@@ -14,9 +14,7 @@ class rsnapshot (
   $package_ensure                = $rsnapshot::params::package_ensure,
   $cron                          = $rsnapshot::params::cron,
 ) inherits rsnapshot::params {
-  if $puppetversion =~ /^(1|2|3)/ {
-    fail('This module requires Puppet 4')
-  }
+  
   if $hosts {
     class { '::rsnapshot::install': }->
     class { '::rsnapshot::config': }