chore(infrastructure): Fail Travis if PR has diffs #KenWasRight (#3170)
chore(infrastructure): Fail Travis if PR has diffs #KenWasRight (#3170)

Ken Was Right.

If there are screenshot diffs, we _should_ fail Travis PR builds by returning a non-zero exit code.

Otherwise, when you look at the build history in Travis, commits that have screenshot diffs are misleadingly displayed with a happy green "passed" badge.
material-components/material-components-web,material-components/material-components-web,material-components/material-components-web