2.0.0

Release 2.0.0

deps: removed all but semver
deps(semver): updated to v7
deps(concat-stream): refactored it away
deps: replaced bluebird with native promises
deps: dropped jasmine
deps: refactored out spawn-shell
fix: normal log messages to stdout (not stderr)
test: replaced jasmine with node --test
test: added a couple E2E tests
remove package-lock.json from repo