Charm proof should report line of duplication in proofed readme, not boilerplate matcher

[Charles Butler]

When charm proof matches boiler plate and raises a W: - it returns the line of the boiler plate matcher that raised the error, not the found line in the README that has matched boilerplate.

Additionally it matches on headers, and it appears this is undesirable behavior, as a good majority of users are wiping the content between headers and re-cycling the document structure.

[Marco Ceppi (marcoceppi)]

Proof should skip any line which starts with # which will fix this for the most part. But also including the actual line in the README that is matched to the actual line in the boilerplate is excellent as well