JessBergs

Chromatic fails when we run it with git version 1.7.1 This is due to an equal sign missing in the `--since` flag in the `git rev-list HEAD` command in https://github.com/chromaui/chromatic-cli/blob/42b836ad95ef5705ebbe0039b7afa00a588e03a2/bin/git/git.js#L117...