add recursive bubble sort

Author: nitish14kumr

contributors.md

@@ -41,5 +41,5 @@
 39. [Sanka Mohottala](https://github.com/sankamohottala)
 40. [Riya Singh](https://github.com/riya24899)
 41. [Sarthak gupta](https://github.com/sarthak-g)
-42. [Your Name](https://github.com/yourusername)
-43. [Nitish Kumar](https://github.com/nitish14kumr)
+42. [Nitish Kumar](https://github.com/nitish14kumr)
+43. [Your Name](https://github.com/yourusername)