Update README.md fix quick demo code import bug (#327)

Author: Deng-Xian-Sheng

README.md

@@ -54,7 +54,7 @@ pip install smolagents
 ```
 Then define your agent, give it the tools it needs and run it!
 ```py
-from smolagents import CodeAgent, DuckDuckGoSearchTool, HfApiModel,
+from smolagents import CodeAgent, DuckDuckGoSearchTool, HfApiModel
 
 agent = CodeAgent(tools=[DuckDuckGoSearchTool()], model=HfApiModel())