Merge pull request puppetlabs#981 from lutaylor/master

Adding default Postgresql version for Ubuntu 18.04

Author: pmcmaw

manifests/globals.pp

@@ -97,6 +97,7 @@
         /^(14.10|15.04|15.10)$/ => '9.4',
         /^(16.04|16.10)$/ => '9.5',
         /^(17.04)$/ => '9.6',
+        /^(18.04)$/ => '10',
         default => undef,
       },
       default => undef,