Gemfile in fluent-plugin-kafka-0.18.1 vs Gemfile in fluent-plugin-kafka-0.19.0

@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
 # Specify your gem's dependencies in fluent-plugin-kafka.gemspec
 gemspec
 
-gem 'rdkafka', '>= 0.6.0' if ENV["USE_RDKAFKA"]
+gem 'rdkafka', ENV['RDKAFKA_VERSION_MIN_RANGE'], ENV['RDKAFKA_VERSION_MAX_RANGE'] if ENV['USE_RDKAFKA']