Docker latest is still on newt version 1.0.0-b2

[Simon Ratner]

Hi devs,

Just did `docker pull mynewt/newt:latest` and looks like newt is still at
1.0.0-b2. Any plans to switch that over to rc1? Are there changes since b2
that may be incompatible with the rc1 core tree?

Cheers,
simon