remove duplicate package

Author: anpin

src/Plotly.NET/Plotly.NET.fsproj

@@ -169,7 +169,6 @@
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="DynamicObj" Version="[2.0.0, 3.0.0)" />
-    <PackageReference Include="DynamicObj" Version="2.0.0" />
     <PackageReference Include="Giraffe.ViewEngine" Version="2.0.0-alpha-1" />
   </ItemGroup>
 </Project>