Merge pull request #1505 from SimonHoenscheid/raise_puppet_systemd_version

puppet/systemd: Allow 6.x

Author: SimonHoenscheid

metadata.json

@@ -18,7 +18,7 @@
     },
     {
       "name": "puppet/systemd",
-      "version_requirement": ">= 4.0.1 < 6.0.0"
+      "version_requirement": ">= 4.0.1 < 7.0.0"
     },
     {
       "name": "puppetlabs/concat",