Fix Metadata

Version of apache was set to something non-existent so CI tests moaned
when trying to install said module once nfsen was installed in puppet's
modules directory

metadata.json

@@ -16,7 +16,7 @@
   ],
   "dependencies": [
     { "name": "puppetlabs/stdlib", "version_requirement": ">=4.6.0" },
-    { "name": "puppetlabs/apache", "version_requirement": ">=2.1.0" },
+    { "name": "puppetlabs/apache", "version_requirement": ">=1.8.0" },
     { "name": "puppetlabs/vcsrepo", "version_requirement": ">=1.3.0" }
   ]
 }