Resolve #91 by including net4.0 targetframework

Author: Gregor Sindl

src/GregsStack.InputSimulatorStandard/GregsStack.InputSimulatorStandard.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFrameworks>net40;netstandard2.0</TargetFrameworks>
     <Title>Input Simulator Standard</Title>
     <Authors>Michael Noonan, Theodoros Chatzigiannakis, Gregor Sindl</Authors>
     <Copyright>Copyright 2009-2019</Copyright>
@@ -27,7 +27,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta2-19367-01">
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>

src/GregsStack.InputSimulatorStandard/InputBuilder.cs

@@ -18,7 +18,7 @@ internal class InputBuilder : IEnumerable<Input>
         /// </summary>
         private readonly List<Input> inputList;
 
-        private static readonly IReadOnlyList<VirtualKeyCode> ExtendedKeys = new List<VirtualKeyCode>
+        private static readonly List<VirtualKeyCode> ExtendedKeys = new List<VirtualKeyCode>
         {
             VirtualKeyCode.NUMPAD_RETURN,
             VirtualKeyCode.MENU,