Update coauthors.yml

Author: pbonte

_data/coauthors.yml

@@ -18,7 +18,7 @@
 "Bonte": 
   - firstname: ["Pieter Bonte", "P. B.", "Pieter", "Bonte"]
     url: http://pieterbonte.be
-    img: https://pbonte.github.io/authors/admin/avatar_hu0ec05eb1796912ef0d58266d8f145dc9_18847_270x270_fill_q75_lanczos_center.jpg
+    img: https://kulak.kuleuven.be/nl/onderzoek/Fotosenfilm/pieter-bonte-2.jpg/@@images/image/preview
     title: Assistant Professor
     affiliation: KU Leuven