drewvanstone: add printing example for Gophercon 2018
drewvanstone: add printing example for Gophercon 2018

Change-Id: I082695e971d4d614cbee15cedeae6095ab9a184c
Reviewed-on: https://go-review.googlesource.com/132265
Run-TryBot: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Ian Cottrell <52376736e5e84615ec49f9c1843b8acc178b1d8d@google.com>

golang/scratch