If you wish to try a version of bashly straight from GitHub before it is released, you can use one of these methods:
alias bashly_edge='docker run --rm -it --user $(id -u):$(id -g) --volume "$PWD:/app" dannyben/bashly:edge'
or build your own image with this Dockerfile.
git clone --depth 1 https://github.com/DannyBen/bashly.git
cd bashly
gem build bashly.gemspec --output bashly.gem
gem install bashly.gem
cd ..