update attribute types for bookmark model

the `hash` attribute has been renamed to `instapaper_hash` as the use of
`hash` collides with equalizer's implementation and results in a
StackLevelError

lib/instapaper/bookmark.rb

@@ -5,17 +5,17 @@ module Instapaper
     include Virtus.value_object
 
     values do
-      attribute :type, String
-      attribute :bookmark_id, String
-      attribute :url, String
-      attribute :title, String
+      attribute :instapaper_hash, String
       attribute :description, String
-      attribute :time, String
-      attribute :starred, String
+      attribute :bookmark_id, Integer
       attribute :private_source, String
-      attribute :hash, String
+      attribute :title, String
+      attribute :url, String
+      attribute :progress_timestamp, DateTime
+      attribute :time, DateTime
       attribute :progress, String
-      attribute :progress_timestamp, String
+      attribute :starred, String
+      attribute :type, String
     end
   end
 end

lib/instapaper/http/utils.rb

@@ -18,7 +18,7 @@ module Instapaper
       # @param klass [Class]
       def perform_request_with_objects(request_method, path, options, klass)
         perform_request(request_method, path, options).collect do |element|
-          klass.new(element)
+          klass.new(coerce_hash(element))
         end
       end
 
@@ -36,7 +36,7 @@ module Instapaper
       def perform_request_with_object(request_method, path, options, klass)
         response = perform_request(request_method, path, options)
         response = response.is_a?(Array) ? response.first : response
-        klass.new(response)
+        klass.new(coerce_hash(response))
       end
 
       # @param path [String]
@@ -48,6 +48,13 @@ module Instapaper
       def perform_request(method, path, options)
         Instapaper::HTTP::Request.new(self, method, path, options).perform
       end
+
+      def coerce_hash(response)
+        if response.key?('hash')
+          response['instapaper_hash'] = response.delete('hash')
+        end
+        response
+      end
     end
   end
 end