Added netstandard2.0

Author: mbonatsos-test

WebPush/WebPush.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>netcoreapp1.0;netcoreapp1.1;netstandard1.3;net45;net46;net47</TargetFrameworks>
+    <TargetFrameworks>netcoreapp1.0;netcoreapp1.1;netstandard1.3;netstandard2.0;net45;net46;net47</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup Condition="'$(TargetFramework)'=='net45' OR '$(TargetFramework)'=='net46' OR '$(TargetFramework)'=='net47'">