Remove System.IO and System.IO.FileSystem.Primitives from dependencies

Author: Vadim Hatsura

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

@@ -30,7 +30,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta-63127-02" PrivateAssets="All"/>
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta-63127-02" PrivateAssets="All" />
     <PackageReference Include="Serilog" Version="2.5.0" />
   </ItemGroup>
 
@@ -63,9 +63,7 @@
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">
-    <PackageReference Include="System.IO" Version="4.1.0" />
     <PackageReference Include="System.IO.FileSystem" Version="4.0.1" />
-    <PackageReference Include="System.IO.FileSystem.Primitives" Version="4.0.1" />
     <PackageReference Include="System.Text.Encoding.Extensions" Version="4.0.11" />
     <PackageReference Include="System.Threading.Timer" Version="4.0.1" />
   </ItemGroup>