message: Add breaking changes between Bond C# 3.x and 4.x
diff: @@ -516,6 +516,22 @@ get a compiler error. To fix, remove the `<Writer>` part:
  [Issue #114](https://github.com/Microsoft/bond/issues/114).
  * Fix for SimpleXmlParser not handling XML declarations. [Issue #112](https://github.com/Microsoft/bond/issues/82)
  +## Breaking changes between 3.x and 4.x ##
  +
  +Bond C# had the following breaking changes introduced in 4.x compared to the
  +3.x versions:
  +
  +* The
  + [Bond.Core.CSharp NuGet package](https://www.nuget.org/packages/Bond.Core.CSharp/)
  + was introduced so that not all uses of Bond depend on Json.NET. The
  + [Bond.Runtime.CSharp package](https://www.nuget.org/packages/Bond.Runtime.CSharp/)
  + still depends on Json.NET and also depends on Bond.Core.CSharp. The
  + primary package remains Bond.CSharp.
  +* `CompactBinaryReader<InputStream>` now
  + [explicitly implements](https://docs.microsoft.com/en-us/dotnet/articles/csharp/programming-guide/interfaces/explicit-interface-implementation)
  + `ICloneable<CompactBinaryReader<InputStream>>` instead of implicitly.
  + `FastBinaryReader` and `SimpleBinaryReader` were likewise changed.
  +
  ## Earlier release ##
  These sections need to be written. In the meantime, consult the
  