fix command in README

README.md

@@ -55,7 +55,7 @@ You need launch tracker and gui seperately cause docker doesn't have gui, so lau
 ```bash
 ./run_docker -host pr1040 -mount ./launch -name track.launch \
     input_image:=/kinect_head/rgb/image_rect_color \
-    mode:=prompt \ 
+    mode:=prompt \
     model_type:=vit_t \
     device:=cuda:0
 ```