[gnome-calculator/gnome-3-30] snap: set grade to stable

[Jeremy Bicha <jbicha src gnome org>]

commit 8b65ab8baf2239fce5b054ba47bac9b8bf4dd407
Author: Jeremy Bicha <jbicha ubuntu com>
Date:   Thu Jan 31 11:28:35 2019 -0500

    snap: set grade to stable
    
    required to publish snaps to the candidate channel

 snap/snapcraft.yaml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/snap/snapcraft.yaml b/snap/snapcraft.yaml
index 81778234..6fbddfbb 100644
--- a/snap/snapcraft.yaml
+++ b/snap/snapcraft.yaml
@@ -20,7 +20,7 @@ description: |
   decimal, and hexadecimal), boolean algebra, one’s and two’s complementation,
   character to character code conversion, and more.
 
-grade: devel # must be 'stable' to release into candidate/stable channels
+grade: stable # must be 'stable' to release into candidate/stable channels
 confinement: strict
 
 plugs: