updated github action

.github/workflows/main.yml

@@ -21,7 +21,7 @@ jobs:
             args: '--target x86_64-apple-darwin'
           - platform: 'macos-latest'
             args: '--target aarch64-apple-darwin'
-          - platform: 'ubuntu-18.04'
+          - platform: 'ubuntu-20.04'
             args: ''
           - platform: 'windows-latest'
             args: '--target x86_64-pc-windows-msvc'
@@ -38,7 +38,7 @@ jobs:
         with:
           targets: aarch64-apple-darwin
       - name: install dependencies (ubuntu only)
-        if: matrix.settings.platform == 'ubuntu-18.04'
+        if: matrix.settings.platform == 'ubuntu-20.04'
         run: |
           sudo apt-get update
           sudo apt-get install -y libgtk-3-dev webkit2gtk-4.0 libappindicator3-dev librsvg2-dev patchelf
@@ -61,7 +61,7 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
-          tagName: app-v__VERSION__ # the action automatically replaces \_\_VERSION\_\_ with the app version
+          tagName: v__VERSION__ # the action automatically replaces \_\_VERSION\_\_ with the app version
           releaseName: 'App v__VERSION__'
           releaseBody: 'See the assets to download this version and install.'
           releaseDraft: true