fixed: #289

Author: maximv

README.md

@@ -18,7 +18,7 @@
 
 [![latest release](https://img.shields.io/badge/latest%20release-v3.0.0-blue)](https://www.nuget.org/packages/FastExpressionCompiler.LightExpression/3.0.0-preview-05)
 [![Windows build](https://ci.appveyor.com/api/projects/status/4iyhed69l3k0k37o/branch/master?svg=true)](https://ci.appveyor.com/project/MaksimVolkau/fastexpressioncompiler/branch/master)[![license](https://img.shields.io/github/license/dadhi/FastExpressionCompiler.svg)](http://opensource.org/licenses/MIT)  
-Targets .NET Standard 2.0 and .NET 4.5  
+Targets .NET Standard 2.0, 2.1 and .NET 4.5  
 NuGet packages:
 
 - FastExpressionCompiler [![NuGet Badge](https://buildstats.info/nuget/FastExpressionCompiler)](https://www.nuget.org/packages/FastExpressionCompiler/3.0.0-preview-05)[![fuget.org package api diff](https://www.fuget.org/packages/FastExpressionCompiler/badge.svg?v=3.0.0-preview-05)](https://www.fuget.org/packages/FastExpressionCompiler/3.0.0-preview-05)  

src/FastExpressionCompiler.LightExpression/FastExpressionCompiler.LightExpression.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
-        <TargetFrameworks>net45;netstandard2.0</TargetFrameworks>
+        <TargetFrameworks>net45;netstandard2.0;netstandard2.1</TargetFrameworks>
 
         <VersionPrefix>3.0.0</VersionPrefix>
         <VersionSuffix>preview-07</VersionSuffix>

src/FastExpressionCompiler/FastExpressionCompiler.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
-        <TargetFrameworks>net45;netstandard2.0</TargetFrameworks>
+        <TargetFrameworks>net45;netstandard2.0;netstandard2.1</TargetFrameworks>
         <VersionPrefix>3.0.0</VersionPrefix>
         <VersionSuffix>preview-07</VersionSuffix>
         <Product>FastExpressionCompiler</Product>