Update ci.yml

Author: uttamukkoji

.github/workflows/ci.yml

@@ -13,10 +13,18 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Setup .NET Core
+    - name: Setup .NET Core 2.1	
+      uses: actions/setup-dotnet@v1	
+      with:	
+        dotnet-version: 2.1.x	
+    - name: Setup .NET Core 3.1	
+      uses: actions/setup-dotnet@v1	
+      with:	
+        dotnet-version: 3.1.x
+    - name: Setup .NET Core 5.0
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 5.0.101
+        dotnet-version: 5.0.x
     - name: Install dependencies
       run: dotnet restore
     - name: Build