always add geocoder to Rack::Request if defined (#1085)

lib/geocoder/request.rb

@@ -78,8 +78,5 @@ module Geocoder
   end
 end
 
-if defined?(ActionDispatch::Request)
-  ActionDispatch::Request.__send__(:include, Geocoder::Request)
-elsif defined?(Rack::Request)
-  Rack::Request.__send__(:include, Geocoder::Request)
-end
+ActionDispatch::Request.__send__(:include, Geocoder::Request) if defined?(ActionDispatch::Request)
+Rack::Request.__send__(:include, Geocoder::Request) if defined?(Rack::Request)