Update app.py

app.py

@@ -236,4 +236,5 @@ class NetworkSimulator:
         plt.savefig(buffer, format='png', dpi=150, bbox_inches='tight')
         buffer.seek(0)
         image_base64 = base64.b64encode(buffer.getvalue()).decode()
-        plt.close()
+        plt.close()
+