Add netstandard2.0 and net46 build targets. This allows for those using

more modern frameworks to leverage the latest and greatest, such as
environment variables on .NET Core 2+ and Process.SafeHandle on .NET
Framework 4.6. Closes #36

MedallionShell.Tests/MedallionShell.Tests.csproj

@@ -8,7 +8,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>Medallion.Shell.Tests</RootNamespace>
     <AssemblyName>MedallionShell.Tests</AssemblyName>
-    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.6</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <ProjectTypeGuids>{3AC096D0-A1C2-E12C-1390-A8335801FDAB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
     <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">10.0</VisualStudioVersion>
@@ -19,6 +19,7 @@
     <CodeAnalysisRuleSet>..\stylecop.analyzers.ruleset</CodeAnalysisRuleSet>
     <NuGetPackageImportStamp>
     </NuGetPackageImportStamp>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>

MedallionShell/MedallionShell.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard1.3;net45</TargetFrameworks>
+    <TargetFrameworks>netstandard1.3;netstandard2.0;net45;net46</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup>
@@ -38,12 +38,8 @@
     <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
   </PropertyGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)' == 'net45'">
-
-  </ItemGroup>
-
-  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard1.3'">
-	  <PackageReference Include="System.Diagnostics.Process" version="4.1.0" />
+  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard1.3' Or '$(TargetFramework)' == 'netstandard2.0'">
+	  <PackageReference Include="System.Diagnostics.Process" version="4.3.0" />
   </ItemGroup>
 
   <ItemGroup>