Update README.md
Custom RPC Allows more than 1 parameter. Fixes #10

The net/rpc infrastructure already ensures that 
arguments are passed as a []interface{}.

We just encode or decode what the net/rpc infrastructure
passes down to the codec.
Update README to include deprecation notice, and add deprecation log to package.
README: updated deprecation notice
Merge pull request #1 from ugorji/master

Up from master