Merge pull request #21 from carbon/master

Cross target netstandard2.0

Author: xoofx

src/Zio/Zio.csproj

@@ -6,7 +6,7 @@
     <NeutralLanguage>en-US</NeutralLanguage>
     <VersionPrefix>0.6.0</VersionPrefix>
     <Authors>Alexandre Mutel</Authors>
-    <TargetFrameworks>net40;net45;netstandard1.3</TargetFrameworks>
+    <TargetFrameworks>net40;net45;netstandard1.3;netstandard2.0</TargetFrameworks>
     <AssemblyName>Zio</AssemblyName>
     <PackageId>Zio</PackageId>
     <PackageTags>filesystem;vfs;VirtualFileSystem;virtual;abstract;directory;files;io;mock</PackageTags>
@@ -31,6 +31,10 @@
     <DefineConstants>$(AdditionalConstants);NETSTANDARD;HAS_ZIPARCHIVE</DefineConstants>
   </PropertyGroup>
 
+  <PropertyGroup Condition=" '$(TargetFramework)' == 'netstandard2.0'">
+    <DefineConstants>$(AdditionalConstants);NETSTANDARD;HAS_ZIPARCHIVE</DefineConstants>
+  </PropertyGroup>
+  
   <PropertyGroup Condition=" '$(TargetFramework)' == 'net45'">
     <DefineConstants>$(AdditionalConstants);NET45;HAS_ZIPARCHIVE</DefineConstants>
   </PropertyGroup>