justforfunc #36: Versions, build constraints, and ldflags

During my Go Tooling in Action Workshop (https://github.com/campoy/go-tooling-...) many people ask how to include version information to binaries, so I decided to make an episode out of it! We will solve the problem using three different techniques: constants and build constraints variables and build constraints variables and ldflags source code: https://github.com/campoy/justforfunc... form: http://form.justforfunc.com planning:   / 1011671677594370049