update contributors badge

Author: Remi-Gau

README.md

@@ -6,7 +6,7 @@
 [![](https://img.shields.io/badge/Octave-CI-blue?logo=Octave&logoColor=white)](https://github.com/cpp-lln-lab/CPP_BIDS/actions)
 ![](https://github.com/cpp-lln-lab/CPP_BIDS/workflows/CI/badge.svg)
 [![codecov](https://codecov.io/gh/cpp-lln-lab/CPP_BIDS/branch/master/graph/badge.svg)](https://codecov.io/gh/cpp-lln-lab/CPP_BIDS)
-[![All Contributors](https://img.shields.io/badge/all_contributors-3-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-5-orange.svg?style=flat-square)](#contributors-)
 
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