target framework 'netstandard2.0', additional Upgrade (#22)

* target framework 'netstandard2.0', additional Upgrade

---------

Co-authored-by: Mathias Buchholz <mathias.buchholz@formware.de>

Author: bookwood1977

src/StringToExpression/StringToExpression.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard1.0;net45</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0</TargetFrameworks>
     <Company>Codecutout</Company>
     <Authors>Alex Davies</Authors>
     <Description>StringToExpression supports the compiling a domain specific string into a .NET expression.
@@ -12,8 +12,8 @@ Out of the box configuration is provided for parsing arithmetic expressions and
     <PackageProjectUrl>https://github.com/codecutout/StringToExpression</PackageProjectUrl>
     <PackageTags>Expression Filter OData Arithmetic DSL</PackageTags>
     <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
-    <Version>1.1.1</Version>
+    <Version>2.1.1</Version>
     <PackageReleaseNotes>Add checks to prevent keywords from being identified within property names.</PackageReleaseNotes>
   </PropertyGroup>
 
-</Project>
+</Project>

tests/StringToExpression.Test/StringToExpression.Test.csproj

@@ -1,14 +1,17 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>    
-    <TargetFramework>net46</TargetFramework>
+    <TargetFramework>net481</TargetFramework>
   </PropertyGroup>
 
   <ItemGroup>
     <PackageReference Include="LinqToQuerystring" Version="0.7.0.8" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0" />
-    <PackageReference Include="xunit" Version="2.3.1" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.3.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
+    <PackageReference Include="xunit" Version="2.7.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.7">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
   </ItemGroup>
 
   <ItemGroup>