Added more snapcraft instructions

release_instructions.txt

@@ -10,6 +10,13 @@
 
 - snapcraft
   - will auto create a candidate, test it works then promote
+  - see https://build.snapcraft.io/user/mikefarah/yq
+  
+  sudo snap remove yq
+  sudo snap install --edge yq
+  
+  then on the mac snapcraft release yq <snap_build_number> stable
+
 
 - brew
   - create pull request pointing to latest git release