Update collaborators.yml

Author: rfablet

_data/collaborators.yml

@@ -13,6 +13,11 @@
   info: Senior Scientist at SHOM, Brest, France
   webpage: https://www.researchgate.net/profile/Frederic_Jourdin
 
+- name: Yann Stéphan
+  photo: rock.jpg
+  info: Senior Scientist at SHOM, Brest, France
+  webpage: https://www.researchgate.net/profile/Yann_Stephan
+
 - name: Julien Le Sommer
   photo: julien.jpg
   info: CNRS Scientist at IGE/MEOM, Grenoble, France