[evince] snap: Change grade

[Ken VanDine <kvandine src gnome org>]

commit 97d9a49d06b1b48df85d1b66f8f34b9bf68d1773
Author: Ken VanDine <ken vandine org>
Date:   Fri Dec 20 09:45:03 2019 -0500

    snap: Change grade

 build-aux/snap/snapcraft.yaml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/build-aux/snap/snapcraft.yaml b/build-aux/snap/snapcraft.yaml
index 476d8c1d..2d74ebf2 100644
--- a/build-aux/snap/snapcraft.yaml
+++ b/build-aux/snap/snapcraft.yaml
@@ -5,7 +5,7 @@ description: |
   This is a document viewer for the GNOME desktop.
   It supports the following document formats: PDF, PS, EPS, XPS, DjVu, TIFF, DVI (with SyncTeX), and Comic 
Books archives (CBR, CBT, CBZ, CB7).
 
-grade: devel # must be 'stable' to release into candidate/stable channels
+grade: stable # must be 'stable' to release into candidate/stable channels
 confinement: strict
 base: core18