Update ci.yml

.github/workflows/ci.yml

@@ -1,14 +1,14 @@
-name: dotnet package
+name: CI
 
 on: [push]
 
 jobs:
   build:
 
-    runs-on: ubuntu-latest
+    runs-on: windows-latest
     strategy:
       matrix:
-        dotnet-version: ['3.0', '3.1.x', '5.0.x', '6.0.x' ]
+        dotnet-version: ['6.0.x']
 
     steps:
       - uses: actions/checkout@v2