metadata: require puppetlabs-apt 1.8.0 or higher

Support for full fingerprints was only added in puppetlabs-apt 1.8.0

This module started using full fingerprints as of d9b1d8c

metadata.json

@@ -9,7 +9,7 @@
   "issues_url": "https://github.com/jfryman/puppet-nginx/issues",
   "dependencies": [
     {"name":"puppetlabs/stdlib","version_requirement":">= 4.2.0 <5.0.0"},
-    {"name":"puppetlabs/apt","version_requirement":">= 1.0.0 <3.0.0"},
+    {"name":"puppetlabs/apt","version_requirement":">= 1.8.0 <3.0.0"},
     {"name":"puppetlabs/concat","version_requirement":">= 1.1.1 <2.0.0"}
   ],
   "requirements": [