Update ci.yml

Author: fmichellonet

.github/workflows/ci.yml

@@ -16,10 +16,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v1
-    - name: Setup .NET Core
+    - name: Setup .NET 6
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 3.1.404
+        dotnet-version: 6.0.100
     # restore dependencies  
     - name: Install dependencies
       run: dotnet restore
@@ -30,4 +30,4 @@ jobs:
       working-directory: .\src
     - name: Test
       run: dotnet test
-      working-directory: .\src
+      working-directory: .\src