fix typo

Co-authored-by: Hiroki Zenigami <[email protected]>

Author: yskkin

lib/line/bot/client.rb

@@ -1034,7 +1034,7 @@ def get_aggregation_list(limit: nil, start: nil)
         channel_token_required
 
         params = {limit: limit, start: start}.compact
-        endpoint_path = "/bot/message/aggregation/list?" + + URI.encode_www_form(params)
+        endpoint_path = "/bot/message/aggregation/list?" + URI.encode_www_form(params)
         get(endpoint, endpoint_path, credentials)
       end