Add Quentin Gallet-Gilles for (at least) a fixer for markupbase.
diff --git a/Misc/ACKS b/Misc/ACKS
index de46956..5999163 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -228,6 +228,7 @@
 Lele Gaifax
 Santiago Gala
 Yitzchak Gale
+Quentin Gallet-Gilles
 Raymund Galvin
 Nitin Ganatra
 Fred Gansevles