[conformal/btcd] 477b73: Make Go 1.2 requirement more noticeable.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcd
  Commit: 477b733ed9d62b7aa720ff8af948546aa5cfc961
      
https://github.com/conformal/btcd/commit/477b733ed9d62b7aa720ff8af948546aa5cfc961
  Author: Dave Collins <da...@conformal.com>
  Date:   2014-01-14 (Tue, 14 Jan 2014)

  Changed paths:
    M README.md

  Log Message:
  -----------
  Make Go 1.2 requirement more noticeable.

It was pointed out in #76 that if you arrived to the Update section
of the README without seeing the Installation section, the requirement for
Go 1.2 is easy to miss.  This commit builds the requirement in the
Installation section and adds it to the Updating section as well to
hopefully make it more noticable.