work on codingseb#77

+ netstandard 2.0 -> 2.1 (to bump c# from 7.3 to 8.0)

Author: lofcz

CodingSeb.ExpressionEvaluator/CodingSeb.ExpressionEvaluator.csproj

@@ -14,13 +14,15 @@
     <PackageLicenseUrl></PackageLicenseUrl>
     <PackageProjectUrl>https://github.com/codingseb/ExpressionEvaluator</PackageProjectUrl>
     <PackageTags>expression-evaluator evaluation math expression evaluate parser mathematical-expressions-evaluator mathematical-expressions script scripting evaluator csharp-script eval execute executescript evaluate-expressions expression-parser fluid calculations formula netcore netstandard net45 interpreter</PackageTags>
-    <TargetFrameworks>net45;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>net45;netstandard2.1</TargetFrameworks>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <PackageIconUrl>https://github.com/codingseb/ExpressionEvaluator/blob/master/Icon.png?raw=true</PackageIconUrl>
     <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
     <PackageReleaseNotes>* Better exception when expression is empty</PackageReleaseNotes>
     <PackageLicenseFile>LICENSE.md</PackageLicenseFile>
     <RepositoryUrl>https://github.com/codingseb/ExpressionEvaluator</RepositoryUrl>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <LangVersion>8.0</LangVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugType>full</DebugType>