backport #6986: writable TerminalWriter.writer for deprecation#7067

RonnyPfannschmidt merged 1 commit intopytest-dev:5.4.xpytest-dev/pytest:5.4.xfrom

RonnyPfannschmidt:backport-6986-terminalreporter.writerRonnyPfannschmidt/pytest:backport-6986-terminalreporter.writerCopy head branch name to clipboard