Ignore "netstandard is not supported" warning

Author: alex-kulakov

Directory.Build.props

@@ -40,6 +40,7 @@
     <ProjectAssetsFile>$(MSBuildProjectExtensionsPath)project.assets.json</ProjectAssetsFile>
     <ProjectAssetsCacheFile>$(MSBuildProjectExtensionsPath)$(MSBuildProjectName).assets.cache</ProjectAssetsCacheFile>
     <OrmKeyFile>$(SolutionDir)Orm\Orm.snk</OrmKeyFile>
+	<NoWarn>$(NoWarn);NETSDK1138</NoWarn>
   </PropertyGroup>
 
   <PropertyGroup>