update readme

README.md

@@ -3,10 +3,12 @@ Install
 ```
 pip install numpy matplotlib plotly
 ```
+
 Run
 ```
 python main.py
 ```
+
 Result:
 - A html with the 3d plot is saved which can be viewed in a browser
 - The xyz trajectory plot opens
@@ -15,8 +17,6 @@ Result:
 1. No need to install plotly
 2. (Un)comment line 26-29 in main.py
 
-Result:
-- The 3d matplotlib plot opens
-- Press q, then the xyz plot opens
+Result: The 3d matplotlib plot and xyz plot opens
 
 Questions: 12432115@zju.edu.cn or open an issue.