[PATCH] snapcraft: update to core18

[Colin King]

From: Colin Ian King <colin.king at canonical.com>

Use core 18 and add grade tag

Signed-off-by: Colin Ian King <colin.king at canonical.com>
---
 snapcraft.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/snapcraft.yaml b/snapcraft.yaml
index 71c33742..866bf590 100644
--- a/snapcraft.yaml
+++ b/snapcraft.yaml
@@ -3,6 +3,8 @@ version: V19.03.00
 summary: The Firmware Test Suite (FWTS)
 description: This is a firmware test suite that performs sanity checks on system firmware. It is intended to identify BIOS and ACPI errors and if appropriate it will try to explain the errors and give advice to help workaround or fix firmware bugs.  It is primarily intended to be a Linux-centric firmware troubleshooting tool.
 confinement: strict
+base: core18
+grade: stable
 
 parts:
     fwts:
-- 
2.20.1