[btcsuite/btcd] ac4879: Add checkpoint at block height 343185.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcd
  Commit: ac4879dde2027de5fdd3fccf596ae8bdaec29647
      
https://github.com/btcsuite/btcd/commit/ac4879dde2027de5fdd3fccf596ae8bdaec29647
  Author: Dave Collins <da...@conformal.com>
  Date:   2015-02-27 (Fri, 27 Feb 2015)

  Changed paths:
    M chaincfg/params.go

  Log Message:
  -----------
  Add checkpoint at block height 343185.