Drop puppet4; require at least Puppet 5.5.8

bastelfreak · bastelfreak · commit f6f0f2d4ef5b · 2019-04-06T18:10:03.000+02:00
diff --git a/metadata.json b/metadata.json
@@ -90,7 +90,7 @@
   "requirements": [
     {
       "name": "puppet",
-      "version_requirement": ">= 4.10.0 < 7.0.0"
+      "version_requirement": ">= 5.5.8 < 7.0.0"
     }
   ],
   "name": "puppet-staging",
