improve codecov: use their interface

[ildyria]

Minor, no need for review.
Will merge if passes.

[d7415]

If we're piping their script in, is there a need to update the version in the repo (rather than deleting it)?

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

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[ildyria]

If we're piping their script in, is there a need to update the version in the repo (rather than deleting it)?

I don't understand your question.

[d7415]

If we're piping their script in, is there a need to update the version in the repo (rather than deleting it)?

I don't understand your question.

Doesn't apply any more. in the first commit you had Travis fetching the codecov script with curl, but also updated our copy. Now it's just using our copy.