With permission from Tom Hawkins, I have updated sv2v's existing BSD
3-Clause license to match the exact text of the standard BSD 3-Clause
license. The wording changes, listed below in full, are entirely
innocuous. The copyright attribution is now simpler. The license heading
and link have been removed from the readme. These changes enable the
license to be appropriately detected by GitHub's license detection tool,
hopefully eliminating any potential confusion about the license in use.

- "author" ==> "copyright holder"
- "his" ==> "its"
- "AUTHORS" ==> "COPYRIGHT HOLDERS AND CONTRIBUTORS"
- "AUTHORS" ==> "COPYRIGHT HOLDER"