Yeah I did use minimist on my [earlier commit](https://github.com/callumlocke/gulp/commit/1f943230475605a289f90334f2727219bd7e7425), but @sindresorhus  [suggested](https://github.com/gulpjs/gulp/pull/299#discussion-diff-9946786) changing it to use env vars, so I updated the PR... Which way is better? I think I agree with Sindre, seems a bit risky to encourage people to add CLI flags as they might conflict with gulp's own flag parsing