LibGit2Sharp.csproj: reduce TargetFrameworks

Author: lytico

LibGit2Sharp/LibGit2Sharp.csproj

@@ -2,7 +2,7 @@
 
   <Import Project="..\..\..\MonoDevelop.props" Condition="Exists('..\..\..\MonoDevelop.props')" />
   <PropertyGroup>
-    <TargetFrameworks>net472;net48;netstandard2.0;netstandard2.1</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;netcoreapp2.1</TargetFrameworks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <Description>LibGit2Sharp brings all the might and speed of libgit2, a native Git implementation, to the managed world of .Net and Mono.</Description>
     <Company>LibGit2Sharp contributors</Company>