[update] update logo url

README.md

@@ -4,7 +4,7 @@ library_name: transformers
 ---
 <div align="center">
   <picture>
-      <img src="figures/stepfun-logo.png" width="30%" alt="StepFun: Cost-Effective Multimodal Intelligence">
+      <img src="https://github.com/stepfun-ai/Step3/blob/main/figures/stepfun-logo.png?raw=true" width="30%" alt="StepFun: Cost-Effective Multimodal Intelligence">
   </picture>
 </div>