Merge pull request #222 from bdovaz/remove-netstandard20-dependencies

Remove unnecessary dependencies on netstandard 2.0 target

Author: nblumhardt

src/Serilog.Sinks.File/Serilog.Sinks.File.csproj

@@ -52,12 +52,6 @@
     <PackageReference Include="System.Runtime.InteropServices" Version="4.3.0" />
   </ItemGroup>
 
-  <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">
-    <PackageReference Include="System.IO.FileSystem" Version="4.3.0" />
-    <PackageReference Include="System.Text.Encoding.Extensions" Version="4.3.0" />
-    <PackageReference Include="System.Threading.Timer" Version="4.3.0" />
-  </ItemGroup>
-
   <ItemGroup>
     <None Include="..\..\assets\serilog-sink-nuget.png" Pack="true" Visible="false" PackagePath="images\icon.png" />
   </ItemGroup>