Remove netcoreapp2.0 test coverage

test/Directory.Build.props

@@ -4,7 +4,7 @@
   <PropertyGroup>
     <DeveloperBuildTestTfms>netcoreapp2.1</DeveloperBuildTestTfms>
     <StandardTestTfms>$(DeveloperBuildTestTfms)</StandardTestTfms>
-    <StandardTestTfms Condition=" '$(DeveloperBuild)' != 'true' ">netcoreapp2.1;netcoreapp2.0</StandardTestTfms>
+    <StandardTestTfms Condition=" '$(DeveloperBuild)' != 'true' ">netcoreapp2.1</StandardTestTfms>
     <StandardTestTfms Condition=" '$(DeveloperBuild)' != 'true' AND '$(OS)' == 'Windows_NT' ">$(StandardTestTfms);net461</StandardTestTfms>
   </PropertyGroup>
 

test/Kestrel.Core.Tests/HttpRequestStreamTests.cs

@@ -92,7 +92,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests
             var stream = new HttpRequestStream(Mock.Of<IHttpBodyControlFeature>());
             Assert.Throws<NotSupportedException>(() => stream.BeginWrite(new byte[1], 0, 1, null, null));
         }
-#elif NETCOREAPP2_0 || NETCOREAPP2_1
+#elif NETCOREAPP2_1
 #else
 #error Target framework needs to be updated
 #endif

test/Kestrel.FunctionalTests/GeneratedCodeTests.cs

@@ -1,7 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-#if NETCOREAPP2_0 || NETCOREAPP2_1
+#if NETCOREAPP2_1
 using System.IO;
 using Xunit;