Cleanup for .NET Standard 2.1

Author: Oren (electricessence)

Open.Text.csproj

@@ -1,24 +1,25 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFrameworks>netstandard2.0;netstandard2.1</TargetFrameworks>
     <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
     <Authors>electricessence</Authors>
     <Company />
     <Product />
     <Description>A set of useful classes for working with strings and formatting values.
 
 Part of the "Open" set of libraries.</Description>
-    <PackageLicenseUrl>https://github.com/electricessence/Open.Text/blob/master/LISCENSE.md</PackageLicenseUrl>
+    <PackageLicenseUrl></PackageLicenseUrl>
     <PackageProjectUrl>https://github.com/electricessence/Open.Text</PackageProjectUrl>
     <Copyright>https://github.com/electricessence/Open.Text/blob/master/LISCENSE.md</Copyright>
     <RepositoryType>git</RepositoryType>
     <RepositoryUrl>https://github.com/electricessence/Open.Text</RepositoryUrl>
     <PackageTags>dotnet, dotnetcore, string, text, format, stringbuilder, extensions</PackageTags>
-    <Version>2.0.4</Version>
+    <Version>2.0.5</Version>
     <PackageReleaseNotes></PackageReleaseNotes>
-    <AssemblyVersion>2.0.4.0</AssemblyVersion>
-    <FileVersion>2.0.4.0</FileVersion>
+    <AssemblyVersion>2.0.5.0</AssemblyVersion>
+    <FileVersion>2.0.5.0</FileVersion>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
@@ -37,7 +38,7 @@ Part of the "Open" set of libraries.</Description>
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Open.MemoryExtensions" Version="2.0.1" />
+    <PackageReference Include="Open.MemoryExtensions" Version="2.0.2" />
   </ItemGroup>
 
 </Project>