Update the citation file

In looks like that the citation file is not correct:

https://github.com/jara001/ng_trajectory/blob/e69be22aee379aa807632599bde3f5b476c8da1a/CITATION.cff

As GitHub generates the reference as:

@proceedings{Klapalek_Car_Racing_Line_2021,
author = {Klapálek, Jaroslav and Novák, Antonín and Sojka, Michal and Hanzálek, Zdeněk},
doi = {10.1109/IROS51168.2021.9636503},
month = {9},
pages = {601--607},
title = {{Car Racing Line Optimization with Genetic Algorithm using Approximate Homeomorphism}},
year = {2021}
}

instead of:

@INPROCEEDINGS{9636503,
  author={Klapálek, Jaroslav and Novák, Antonín and Sojka, Michal and Hanzálek, Zdeněk},
  booktitle={2021 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)}, 
  title={Car Racing Line Optimization with Genetic Algorithm using Approximate Homeomorphism}, 
  year={2021},
  volume={},
  number={},
  pages={601-607},
  keywords={},
  doi={10.1109/IROS51168.2021.9636503},
  ISSN={2153-0866},
  month={Sep.},}

jara001 / ng_trajectory

Update the citation file #29