Update README.md

[AnObstacle]

Add code-coverage option in the README.md.

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[AnObstacle]

I signed it!

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[filipesilva]

Thanks for updating this, totally slipped my mind when updating the command!

[filipesilva]

Can you add a newline before You can run tests with coverage, remove the =true bit (it's not needed) and add this at the end?

Linting during tests is also available via the `--lint` flag?

[filipesilva]

Thanks for integrating those changes, this looks ready to merge!

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