[btcsuite/btcd] df20c1: Fix typos in changelog.

[Mawuli Adzoe]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcd
  Commit: df20c1074c7eb6a765406e7f2d1ced3a39e63991
      
https://github.com/btcsuite/btcd/commit/df20c1074c7eb6a765406e7f2d1ced3a39e63991
  Author: Mawuli Adzoe <mawuli.kofi.maw...@gmail.com>
  Date:   2015-12-29 (Tue, 29 Dec 2015)

  Changed paths:
    M CHANGES

  Log Message:
  -----------
  Fix typos in changelog.

Reviewed changelog and fixed 2 tiny typos.