feat(saucelabs): Hide SauceLabs key from logs
feat(saucelabs): Hide SauceLabs key from logs

Using `selenium-sauce` logs the saucelabs keysm which are private. This is particularly problematic
when running on CI for public projects. These changes mask part of the key so that the log looks
like the following:

'ABCD-EFGH-1234' -> '**********1234'

alexbrombal/selenium-sauce,alexbrombal/selenium-sauce