[btcsuite/btcrpcclient] f9ac1a: build: Add gosimple linter to goclean.sh.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcrpcclient
  Commit: f9ac1a778654fa3d66495a327f050d68e40ba157
      
https://github.com/btcsuite/btcrpcclient/commit/f9ac1a778654fa3d66495a327f050d68e40ba157
  Author: Dave Collins <da...@conformal.com>
  Date:   2016-11-16 (Wed, 16 Nov 2016)

  Changed paths:
    M goclean.sh

  Log Message:
  -----------
  build: Add gosimple linter to goclean.sh.

This modifies the goclean.sh script to include the gosimple lint tool to
the gometalinter configuration.