Update maintainer information in README.md

Author: Nicogene

README.md

@@ -341,5 +341,5 @@ This repository is maintained by:
 
 | | |
 |:---:|:---:|
-| [<img src="https://github.com/traversaro.png" width="40">](https://github.com/traversaro) | [@traversaro](https://github.com/traversaro) |
+| [<img src="https://github.com/Nicogene.png" width="40">](https://github.com/Nicogene) | [@Nicogene](https://github.com/Nicogene) |