FIX: version check

api.discourse.org server apparently does not like GET
requests that have a port number in the headers Host entry

Additionally fix the actual GET query; it should use query
parameters not a body.

lib/discourse_hub.rb

@@ -42,8 +42,9 @@ module DiscourseHub
   def self.singular_action(action, rel_url, params={})
     JSON.parse(Excon.send(action,
       "#{hub_base_url}#{rel_url}",
-      body: params.to_query,
-      headers: { 'Referer' => referer, 'Accept' => accepts.join(', ') }
+      headers: { 'Referer' => referer, 'Accept' => accepts.join(', ') },
+      :query => params,
+      :omit_default_port => true
     ).body)
   end