Update README.md

RPI-Void-Star · Sep 29, 2016 · 13a10d8 · 13a10d8
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 Basic serial demo using goburrow's golang serial library.
 
+First you'll need to go environment: https://golang.org/doc/install
+
 To run the program:
 
 1. Install the program: `go get github.com/rpi-void-star/serial-demo-go`