[babl] HSV: add alpha model meta data

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 15f3dfd7718e2f0095d80ce441ca863295da95dd
Author: Øyvind Kolås <pippin gimp org>
Date:   Tue Nov 27 00:24:10 2018 +0100

    HSV: add alpha model meta data

 extensions/HSV.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/extensions/HSV.c b/extensions/HSV.c
index f486981..f0492c2 100644
--- a/extensions/HSV.c
+++ b/extensions/HSV.c
@@ -91,6 +91,7 @@ models (void)
     babl_component ("saturation"),
     babl_component ("value"),
     babl_component ("alpha"),
+    "alpha",
     NULL
   );