Update example output for default formatter

The default formatter now includes the name of the linter. Update the
README's example output to reflect this fact.

Change-Id: I658c6aca972b1c5a028126c01d7f4e99002e5934
Reviewed-on: http://gerrit.causes.com/42341
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>