I see 0.12.2 on master, but not 0.12.3, even though it's released:

https://github.com/Masterminds/glide/releases/tag/v0.12.3

Looks like glide.go still contains:

var version = "0.12.0-dev"

Furthermore, it looks like https://github.com/Masterminds/glide/tree/Release-branch-0.12.x is several commits ahead of master. Why not treat master as the latest release?