Github rate limit exceeded

[lopuhin]

When running codespeedinfo.get_latest_commit, the following error happens after a while:

  File "bench.py", line 88, in bookworm
    workpath)
  File "bench.py", line 55, in calculator
    codespeedinfo.uploadresult(test, w)
  File "/scrapy-bench/codespeedinfo.py", line 27, in uploadresult
    commit = get_latest_commit('scrapy', 'scrapy')
  File "/scrapy-bench/codespeedinfo.py", line 16, in get_latest_commit
    return requests.get(url).json()[0]
KeyError: 0

The reason is this:

{u'documentation_url': u'https://developer.github.com/v3/#rate-limiting',
 u'message': u"API rate limit exceeded for 54.72.188.245. (But here's the good news: Authenticated requests get a higher rate limit. Check out the documentation for more details.)"}