remove netcore2.0.1 from unit test

Author: JonathanMagnan

test/System.Linq.Dynamic.Core.Tests/System.Linq.Dynamic.Core.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk" ToolsVersion="15.0">
     <PropertyGroup>
         <Authors>Stef Heyenrath</Authors>
-        <TargetFrameworks>net452;netcoreapp2.1;netcoreapp3.1</TargetFrameworks>
+        <TargetFrameworks>net452;netcoreapp3.1</TargetFrameworks>
         <AssemblyName>System.Linq.Dynamic.Core.Tests</AssemblyName>
         <DebugType>full</DebugType>
         <SignAssembly>True</SignAssembly>