• Add docs: compose, chain, env
• Add examples: compose, chain, env, exec, executable scripts
• Improve variables output
• Add robo vars (robo.path, robo.file)
• Fix args escape using mattn/go-shellwords
• Interpolate env vars from variables:...
• Resolve --config path correctly
• Add env var support to allow re-use of robo conf files
• Run script directly if it is executable
• Upgrade to go1.12, use modules

You can also install via go get github.com/tj/robo@latest.