Custom Serialisation docs appear to be out of date.

[shadow7412]

https://github.com/msgpack/msgpack-cli/wiki/Custom-serialization#custom-serializer

When I attempt to create a serialiser class as per this documentation I get the following warning;

Constructor 'MsgPack.Serialization.MessagePackSerializer.MessagePackSerializer' is obsolete: Use MessagePackSerializer (SerlaizationContext) instead.

Also, a code example of how you register this serialiser properly would be useful.

[yfakariya]

Sorry for delayed response, and thank you for feedback!
I will fix the doc soon.