remove max_bytes_per_partition hardcoded config

lib/racecar/consumer.rb

@@ -4,7 +4,7 @@
 
 module Racecar
   class Consumer
-    Subscription = Struct.new(:topic, :start_from_beginning, :max_bytes_per_partition, :additional_config)
+    Subscription = Struct.new(:topic, :start_from_beginning, :additional_config)
 
     class << self
       attr_accessor :max_wait_time
@@ -22,19 +22,16 @@ def subscriptions
       # @param topics [String] one or more topics to subscribe to.
       # @param start_from_beginning [Boolean] whether to start from the beginning or the end
       #   of each partition.
-      # @param max_bytes_per_partition [Integer] the maximum number of bytes to fetch from
-      #   each partition at a time.
       # @param additional_config [Hash] Configuration properties for consumer.
       #   See https://github.com/edenhill/librdkafka/blob/master/CONFIGURATION.md
       # @return [nil]
       def subscribes_to(
         *topics,
         start_from_beginning: true,
-        max_bytes_per_partition: 1048576,
         additional_config: {}
       )
         topics.each do |topic|
-          subscriptions << Subscription.new(topic, start_from_beginning, max_bytes_per_partition, additional_config)
+          subscriptions << Subscription.new(topic, start_from_beginning, additional_config)
         end
       end
     end

lib/racecar/consumer_set.rb

@@ -215,7 +215,6 @@ def rdkafka_config(subscription)
         "client.id"               => @config.client_id,
         "enable.partition.eof"    => false,
         "fetch.max.bytes"         => @config.max_bytes,
-        "message.max.bytes"       => subscription.max_bytes_per_partition,
         "fetch.min.bytes"         => @config.fetch_min_bytes,
         "fetch.wait.max.ms"       => @config.max_wait_time_ms,
         "group.id"                => @config.group_id,