Support .NET Core 2.1 & 3.1; drop 2.0

Author: jburnett

AMT.LinqExtensions/AMT.LinqExtensions.csproj

@@ -22,6 +22,11 @@
     <Title>LINQ Extensions by AltaModa Technologies</Title>
   </PropertyGroup>
 
+<!--
+  .NET Core 3.1 (LTS) EOL 12/3/2022
+  .NET Core 2.1 (LTS) EOL 8/21/2021
+  .NET Core 1.1 EOL 6/27/2019
+-->
   <PropertyGroup Condition=" '$(OS)' == 'Windows_NT' ">
     <TargetFrameworks>netstandard2.0;net461;net462;net47;net471;net472;</TargetFrameworks>
   </PropertyGroup>

test/test.csproj

@@ -7,11 +7,16 @@
     <IsPackable>false</IsPackable>
   </PropertyGroup>
 
+<!--
+  .NET Core 3.1 (LTS) EOL 12/3/2022
+  .NET Core 2.1 (LTS) EOL 8/21/2021
+  .NET Core 1.1 EOL 6/27/2019
+-->
   <PropertyGroup Condition=" '$(OS)' == 'Windows_NT' ">
-      <TargetFrameworks>netcoreapp2.0;netcoreapp2.1;net461;net462;net47;net471;net472;</TargetFrameworks>
+      <TargetFrameworks>netcoreapp3.1;netcoreapp2.1;net461;net462;net47;net471;net472;</TargetFrameworks>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(OS)' != 'Windows_NT' ">
-      <TargetFrameworks>netcoreapp2.0;netcoreapp2.1</TargetFrameworks>
+      <TargetFrameworks>netcoreapp3.1;netcoreapp2.1</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>