fixing issue with dict being called

```sh
# gitissuebot-approve -c /var/run/GitIssueBot/music.yaml 
Traceback (most recent call last):
  File "/usr/local/bin/gitissuebot-approve", line 9, in <module>
    load_entry_point('GitIssueBot==0.1.0-2-g3e2e97c', 'console_scripts', 'gitissuebot-approve')()
  File "/usr/local/lib/python2.7/dist-packages/GitIssueBot-0.1.0_2_g3e2e97c-py2.7.egg/gitissuebot/approve.py", line 422, in main
    check_issues(config, file=args.config, dryrun=config["dryrun"])
  File "/usr/local/lib/python2.7/dist-packages/GitIssueBot-0.1.0_2_g3e2e97c-py2.7.egg/gitissuebot/approve.py", line 196, in check_issues
    bot_user_id = get_bot_id(headers)
  File "/usr/local/lib/python2.7/dist-packages/GitIssueBot-0.1.0_2_g3e2e97c-py2.7.egg/gitissuebot/approve.py", line 104, in get_bot_id
    myself = r.json()
TypeError: 'dict' object is not callable