Ping an author of a commit that caused to fail the CI

[pomek]

Suggested merge commit message (convention)

Feature (tests): The notify-travis-status script will mention an author of a commit that caused to fail the CI.

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Additional information

More details about the implementation in the internal repo.

[coveralls]

Coverage remained the same at 87.066% when pulling 769a01b on i/internal/651 into 22e4fb1 on master.

[mlewand]

LGTM, minor rewording suggested.

@pomek there's one more action I see here - we need to make sure that onboarding instructions include a step with adding new dev to the introduced .json list.