Release new version- for Toward Functional Programming #452

- updated REFERENCES.md
- updated README.md

Author: mpostol

README.md

@@ -8,6 +8,7 @@ software engineering, sequential programming, adaptive programming, concurrent p
 
 |       Release       | Title                                                                 |              DOI               |       Date        |
 | :-----------------: | --------------------------------------------------------------------- | :----------------------------: | :---------------: |
+| [5.20.02][REL52002] | [Toward Functional Programming][REL52002]                             | [![DOI][BDGL52002]][DOIL52002] |   July 24, 2025   |
 | [5.20.01][REL52001] | [Graphical User Interface; 2025 Summer][REL52001]                     | [![DOI][BDGL52001]][DOIL52001] |   July 1, 2025    |
 |    [5.2][REL52]     | [External Data Added to the ebook][REL52]                             |     [![DOI][BDG52]][DOI52]     |   July 9, 2024    |
 |    [5.1][REL51]     | [Information Computation Udemy Course Online Publication][udemyPiPIC] |     [![DOI][BDG51]][DOI51]     |  August 1, 2023   |
@@ -20,6 +21,10 @@ software engineering, sequential programming, adaptive programming, concurrent p
 >
 > [**TUL IT**][TULIT]: stands for Institute of Information Technology, Lodz University of Technology
 
+[REL52002]: https://github.com/mpostol/TP/releases/tag/5.20.02
+[DOIL52002]: https://doi.org/10.5281/zenodo.16414132
+[BDGL52002]: https://zenodo.org/badge/DOI/10.5281/zenodo.16414132.svg
+
 [REL52001]: https://github.com/mpostol/TP/releases/tag/5.20.01
 [DOIL52001]: https://doi.org/10.5281/zenodo.15777747
 [BDGL52001]: https://zenodo.org/badge/DOI/10.5281/zenodo.15777747.svg

REFERENCES.md

@@ -44,6 +44,7 @@
 - [Postół M, profile on facebook](https://www.facebook.com/mariusz.postol/)
 - [Postół M, profile on wordpress](http://mpostol.wordpress.com/)
 - [Postół M, profile on c-sharpcorner](https://www.c-sharpcorner.com/members/mariusz-postol)
+- [Programming in Practice Education on LinkedIn](https://www.linkedin.com/groups/7478959/?lipi=urn%3Ali%3Apage%3Ad_flagship3_groups_index%3B5I8YDiDHRK2rYN7H36la9w%3D%3D)
 
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