Support net461 taget

Author: sevoku

LibGit2Sharp/LibGit2Sharp.csproj

@@ -2,7 +2,8 @@
 
   <Import Project="..\..\..\MonoDevelop.props" Condition="Exists('..\..\..\MonoDevelop.props')" />
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;net46</TargetFrameworks>
+    <TargetFrameworks>net471;net461;netcoreapp2.0</TargetFrameworks>
+    <TargetFramework>net471</TargetFramework>
     <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>
@@ -31,8 +32,11 @@
 
   <ItemGroup>
     <PackageReference Include="LibGit2Sharp.NativeBinaries" Version="[2.0.267]" PrivateAssets="none" />
+    <PackageReference Include="Nerdbank.GitVersioning" Version="2.1.23" PrivateAssets="all" />
+  </ItemGroup>
+
+  <ItemGroup Condition="!Exists('..\..\..\MonoDevelop.props')">
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta-63127-02" PrivateAssets="all" />
-    <PackageReference Include="Nerdbank.GitVersioning" Version="2.2.13" PrivateAssets="all" />
   </ItemGroup>
 
   <Import Project="..\Targets\CodeGenerator.targets" />