[btcsuite/btcd] 0d7f52: mining: Correctly format log messages. (#685)

[Jonathan Gillham]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcd
  Commit: 0d7f52660096c5a22f2cb95c102e0693f773a593
      
https://github.com/btcsuite/btcd/commit/0d7f52660096c5a22f2cb95c102e0693f773a593
  Author: Jonathan Gillham <jongill...@users.noreply.github.com>
  Date:   2016-04-27 (Wed, 27 Apr 2016)

  Changed paths:
    M mining.go

  Log Message:
  -----------
  mining: Correctly format log messages. (#685)

Type feePerKB is an int64 and therefore is not correctly interpreted by
format verb f.