added: update to README.md to indicate on how to use the new feature.
added: update to README.md to indicate on how to use the new feature.

Signed-off-by: Toure Dunnon <d0e7b399b1ede99f696719c002bcc01f9a45c4b5@anchore.com>

anchore/syft,anchore/syft,anchore/syft,anchore/syft,anchore/syft,anchore/syft,anchore/syft