Properly handle network exceptions in ronin url --status (closes #211…

…).

* Print an error message to stderr containing the URL and the exception
  message.

lib/ronin/cli/commands/url.rb

@@ -141,7 +141,11 @@ def process_value(url)
           elsif options[:fragment]
             puts uri.fragment
           elsif options[:status]
-            puts "#{uri.status} #{uri}"
+            begin
+              puts "#{uri.status} #{uri}"
+            rescue => error
+              stderr.puts "#{uri}: #{error.message}"
+            end
           else
             puts uri
           end