readme.md instructions not working

[SuperElectron]

Followed the instructions and your package isn't working. It looks great and I hope to get it working for what I am trying to do!

[Guber]

Yeah I had to change few things to get it to run:

• to get through module report not found errors, report module needs to be relative imported (from .report instead of from report in runner.py)
• line 71 in runner.py, method _get_report , had to add encoding="utf-8" to open method to get rid of UnicodeDecodeError
• line 75 in runner.py, method _clean, had to wrap os.remove with try except for OSError to get rid of WIn32 Permission Error
  -finally line 95 in report.py had to wrap v.get('score', 0) with or 0 => (v.get('score', 0) or 0) as get method returned None although it had a default value...

[adamcupial]

@Guber can you PR if you have made those changes?
Also - see lighthouse-ci, google has just shipped it, it's a CI-compatible lighthouse at least.