[conformal/btcec] c4fa69: Use a more specific license adjective.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcec
  Commit: c4fa69d4908d8d84b66c33166772f23ff6e4e1a9
      
https://github.com/conformal/btcec/commit/c4fa69d4908d8d84b66c33166772f23ff6e4e1a9
  Author: Dave Collins <da...@conformal.com>
  Date:   2014-08-10 (Sun, 10 Aug 2014)

  Changed paths:
    M README.md

  Log Message:
  -----------
  Use a more specific license adjective.