Add option for coverage data file

[zageyiff]

Before anything else I want to thank for this great plugin.

This is not an issue, but more a request. To add the option of where to generate the coverage data file. As of now the file is generated at the same level of the setup.py or cwd in a file called '.coverage'

Thanks

[wojtossfm]

Not sure if I understand the issue correctly but isn't this already possible by using the --xcoverage-file=<path> option? Or alternatively you could use --xcoverage-to-stdout and redirect to wherever you want. Please maybe rephrase if I'm mistaken.