Merge pull request #454 from splitio/redis-uniques-imp

[Fix] Removed .last

Author: sanzmauro

lib/splitclient-rb/cache/senders/impressions_adapter/redis_sender.rb

@@ -16,7 +16,7 @@ def record_uniques_key(uniques)
 
           size = @adapter.add_to_queue(unique_keys_key, uniques_formatter(uniques))
 
-          @adapter.expire(unique_keys_key, EXPIRE_SECONDS) if uniques.length == size.last
+          @adapter.expire(unique_keys_key, EXPIRE_SECONDS) if uniques.length == size
         rescue StandardError => e
           @config.log_found_exception(__method__.to_s, e)
         end