Add test with fully numerical hostname

Author: ekohl

spec/type_aliases/fqdn_spec.rb

@@ -22,6 +22,7 @@
         "\nexample",
         "\nexample\n",
         "example\n",
+        '10.10.10.10.10',
         '2001:DB8::1',
         'www www.example.com',
       ].each do |value|

spec/type_aliases/host_spec.rb

@@ -24,6 +24,7 @@
         '[email protected]',
         '%.example.com',
         '2001:0d8',
+        '10.10.10.10.10',
       ].each do |value|
         describe value.inspect do
           it { is_expected.not_to allow_value(value) }