[btcsuite/btcec] f9365f: Update btcec.go

[David Evans]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcec
  Commit: f9365fd5425c4d7f0bad9733d4fb0bbfb82b66f6
      
https://github.com/btcsuite/btcec/commit/f9365fd5425c4d7f0bad9733d4fb0bbfb82b66f6
  Author: David Evans <ev...@cs.virginia.edu>
  Date:   2015-01-20 (Tue, 20 Jan 2015)

  Changed paths:
    M btcec.go

  Log Message:
  -----------
  Update btcec.go

Updated link to SEC 2: Recommended Elliptic Curve Domain Parameters standard 
(URL given no longer exists).