<!-- 
Thanks for contributing a pull request! 
Please check this document before submitting:
- [How to contribute](https://atsushisakai.github.io/PythonRobotics/how_to_contribute.html#adding-a-new-algorithm-example)

Note that this is my hobby project; I appreciate your
patience during the review process.

Again, thanks for contributing!
-->

#### Reference issue
<!--Example: fix #392-->

#### What does this implement/fix?
<!--Please explain your changes.-->

#### Additional information
<!--Any additional information you think is important.-->

#### CheckList
-[] Did you add an unittest for your new example or defect fix?
-[] Did you add documents for your new example?
-[] All CIs are green? (You can check it after submitting)