fix typo

Author: graysonchen

examples/memory/memory_save.rb

@@ -3,7 +3,7 @@
 client = OpenAISwarm.new
 model = ENV['SWARM_AGENT_DEFAULT_MODEL'] || "gpt-4o-mini"
 
-memory = OpenAISwarm::Memory.new({ memory_fields: ["language", "grade", "name", "sex"] })
+memory = OpenAISwarm::Memory.new(memory_fields: ["language", "grade", "name", "sex"])
 memory.function
 
 def get_weather(location:)