Fixing bytes-related TypeError upon report uploading when using python3

[lastmikoi]

When trying to submit a coverage.xml file, under Python 3.5.0 and using a git-installed codacy-coverage, the following exception is raised:

Traceback (most recent call last):
  File "VENV_PATH/bin/python-codacy-coverage", line 9, in <module>
    load_entry_point('codacy-coverage==1.1.0', 'console_scripts', 'python-codacy-coverage')()
  File "VENV_PATH/lib/python3.5/site-packages/codacy/__init__.py", line 6, in main
    return reporter.run()
  File "VENV_PATH/lib/python3.5/site-packages/codacy/reporter.py", line 140, in run
    upload_report(report, CODACY_PROJECT_TOKEN, args.commit)
  File "VENV_PATH/lib/python3.5/site-packages/codacy/reporter.py", line 110, in upload_report
    message = json.loads(r.content)['success']
  File "/usr/lib64/python3.5/json/__init__.py", line 312, in loads
    s.__class__.__name__))
TypeError: the JSON object must be str, not 'bytes'

This commit fixes this issue by adding the six library as a dependency and implements a different behaviour if Python3 is being used.

[lastmikoi]

Mh, it would seems that #7 already deals with this issue in a much smarter way (using Request's Response.text attribute)

Sorry for the noise, closing this issue.