Removed goutte driver from docs
Removed goutte driver from docs

Not a tested driver for framework tests. Might work, but we shouldn't recommend it. Plus, we'll need to add it as a composer requirement if mentioned in `behat.yml` (see #94).

silverstripe-labs/silverstripe-behat-extension,silverstripe/silverstripe-behat-extension,tractorcow/silverstripe-behat3,silverstripe/silverstripe-behat-extension