Informed action how to proceed

.github/workflows/dotnetcore.yml

@@ -12,7 +12,7 @@ jobs:
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 2.2.108
+        dotnet-version: 3.1.x
     - name: Build with dotnet
       run: dotnet publish -r win-x64  
     - uses: actions/upload-artifact@v1