Please add flag --quiet to submission script

Summary

Add flag --quiet/-q to report submission.

Description

Please look at this travis CI log: https://api.travis-ci.org/v3/job/527399545/log.txt
95% of lines are produced by codecov bash script. We would like to silence those warnings.

Examples

Currently we submit report as
bash <(curl -s https://codecov.io/bash) -s build 2>/dev/null

But we would like to write
bash <(curl -s https://codecov.io/bash) -s build --quiet instead.

Versions

C++17, TravisCI, Linux, g+±8.1, gcov-8.1, gcovr 4.1