chore(release): prepare for v0.8.0

feat: Support Broker Authentication Mechanisms [BC]

feat(ci): Use Cross to build binaries for all available targets

chore: .gitignore .DS_Store for mac contributors

docs: add _Broker APIs_ section

docs: format Environment Variables and nest under Usage

docs: add options section (output of --help)

docs: remove duplicate usage snippet

refactor: save binary to $USER directory $HOME/.local/bin

docs: bump version to 0.7.2

build(deps): bump h2 from 0.3.15 to 0.3.17

refactor: separates brocker cli in specific lib

chore(release): prepare for v0.7.2

fix: Github release body 🤬

chore(release): prepare for v0.7.1