[btcsuite/btcrpcclient] 1b800b: build: Add unconvert linter to goclean.sh.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcrpcclient
  Commit: 1b800b69cf99d2c2ab4c35be26db7ffe1c8657e0
      
https://github.com/btcsuite/btcrpcclient/commit/1b800b69cf99d2c2ab4c35be26db7ffe1c8657e0
  Author: Dave Collins <da...@conformal.com>
  Date:   2016-11-16 (Wed, 16 Nov 2016)

  Changed paths:
    M goclean.sh

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

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