Updated condition for request method type for get_list

numberOfResults acceptable values are 0 < val < 200,
according to expedia API documentation.
Instead a POST request should be made 
if a 'long' hotelIdList is provided. 
The boundaries for length of a long list are not specified 
in the documentation.

lib/expedia/api.rb

@@ -6,11 +6,9 @@ class Api
     # @param args [Hash] All the params required for 'get_list' call
     # @return [Expedia::HTTPService::Response] on success. A response object representing the results from Expedia
     # @return [Expedia::APIError] on Error.
-    # @note A POST request is made instead of GET if 'numberOfResults' > 200
+    # @note A POST request is made instead of GET if 'hotelIdList' length > 200
     def get_list(args)
-      no_of_results = 'numberOfResults'
-      method = (args[no_of_results.to_sym].to_i > 200 || args[no_of_results].to_i > 200) ||
-        args[no_of_results.downcase.to_sym].to_i > 200 || args[no_of_results.downcase].to_i > 200 ? :post : :get
+      method = (args[:hotelIdList] || args["hotelIdList"] || []).length > 200 ? :post : :get
       services('/ean-services/rs/hotel/v3/list', args, method)
     end