Don't eat stderr when subprocesses are run successfully

[marco-c]

There might be useful information anyway, so we shouldn't eat it in

code-coverage/bot/code_coverage_bot/utils.py

Line 28 in a2e21d8

def run_check(command, **kwargs):

.

[anubhabsen]

Would it be enough to return the error along with the output in the run_check() function and handle it in the other files where the function is called?

[marco-c]

I think we can just stop piping it (so it's redirected to the parent process' stderr).