Remove target support for .NET Framework 4.8 since appveyor doesn't support this yet.

Also remove deprecated build scripts.

Author: Latency McLaughlin

ReadLine/ReadLine.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net45;net461;net472;net48;netcoreapp2.2;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>net45;net461;net472;netcoreapp2.2;netstandard2.0</TargetFrameworks>
     <AssemblyTitle>ReadLine</AssemblyTitle>
     <AssemblyName>ReadLine</AssemblyName>
     <PackageId>ReadLine</PackageId>

build.sh

@@ -1,2 +0,0 @@
-dotnet test .\test\ReadLine.Tests\ReadLine.Tests.csproj
-if ($LastExitCode -ne 0) { $host.SetShouldExit($LastExitCode) }