Fix snap (#2255)

* fixing snap on ubuntu

* remove release candidates from snapcraft release

snapcraft.yaml

@@ -12,7 +12,8 @@ description: |
   tools.
 grade: stable  # must be 'stable' to release into candidate/stable channels
 confinement: strict  # use 'strict' once you have the right plugs and slots
-#confinement: devmode  # use 'strict' once you have the right plugs and slots
+#confinement: devmode  # use 'strict' once you have the right plugs and slot
+compression: lzo
 architectures:
   - build-on: amd64
 
@@ -28,14 +29,16 @@ apps:
       QT_QPA_PLATFORMTHEME: gtk3
     slots: [dbus-flameshot]
     plugs:
-      - kde-frameworks-5-plug
       - home
       - removable-media
       - network
       - network-bind
       - opengl
       - x11
       - wayland
+      - desktop
+      - desktop-legacy
+      - unity7
 
 parts:
   flameshot:
@@ -46,7 +49,8 @@ parts:
     source-type: git
     override-pull: |
       snapcraftctl pull
-      last_committed_tag="$(git tag -l --sort=-v:refname | head -1)"
+      # remove release candidates
+      last_committed_tag="$(git tag -l --sort=-v:refname | grep -v rc | head -1)"
       git_revno="$(git rev-list $(git describe --tags --abbrev=0)..HEAD --count)"
       git_hash="$(git rev-parse --short HEAD)"
       snapcraftctl set-version "${last_committed_tag}+git${git_revno}.${git_hash}"