Fix module hard requirement for apt to < 6.0.0 (#153)

Resolves #152

Author: meltingrobot

metadata.json

@@ -14,7 +14,7 @@
     },
     {
       "name": "puppetlabs-apt",
-      "version_requirement": ">= 4.1.0 < 4.5.1"
+      "version_requirement": ">= 4.1.0 < 6.0.0"
     },
     {
       "name": "puppet-archive",