Generated *.coverage.txt files from Xcode coverage parsing not cleaned up with -c

[provTheodoreNewell]

https://github.com/codecov/codecov-bash/blob/4678d212cce2078bbaaf5027af0c0dafaad6a095/codecov#L211

Running codecov-bash to parse coverage from an Xcode project leaves *.coverage.txt files in the current directory. I would expect these files to be removed with the -c argument.

[drazisil]

https://github.com/codecov/codecov-bash/blob/master/codecov#L1349-L1352

It looks like the clean flag only removes the uploaded reports.