Update hellonode.md
Update hellonode.md

Docker for Windows 1.12/1.12.1 does not work as described when pushing images to the google container image registry - it stops with an error message. It takes a long time (6h to several days) to find a solution and since Docker is becoming more popular on windows this seems worth mentioning.
erictune/erictune.github.io,erictune/erictune.github.io,erictune/erictune.github.io,erictune/erictune.github.io,erictune/erictune.github.io