Update README.md

Author: yuhsukeogawa

README.md

@@ -36,10 +36,6 @@ https://github.com/cisco-open/network-sketcher/assets/13013736/b76ec8fa-44ad-4d0
 - Ver 2.5.2
   -  [Added ability to export AI Context to interact with LLM](https://github.com/cisco-open/network-sketcher/wiki/7%E2%80%904.-Export-AI-Context)
 ![image](https://github.com/user-attachments/assets/14892ee6-edbe-44be-8849-09eba0309a6f)
-
-- Ver 2.5.1
-  - [Added the ability to export flow communication information on a per-device basis](https://github.com/cisco-open/network-sketcher/wiki/9%E2%80%905.export_per_device_flow_table)
-   ![image](https://github.com/user-attachments/assets/7d751a6e-3664-4014-a8fd-dc919584ae45)
 
 - Ver 2.5.0
   - [Communication flow management functionality has been added.](https://github.com/cisco-open/network-sketcher/wiki/9%E2%80%901.Exporting-Flow-files)
@@ -167,3 +163,4 @@ limitations under the License.
 
 
 
+