Fix reference to jasperb in mailing-list.md

Without this fix, Jekyll crashes with a RuntimeError.

Signed-off-by: Sandro Bonazzola <sandro.bonazzola@gmail.com>

Author: sandrobonazzola

source/community/about/mailing-lists.md

@@ -6,7 +6,7 @@ authors:
   - dneary
   - quaid
   - theron
-  - Jasper Berton
+  - jasperb
 ---
 
 # Mailing lists