chdir should output to stdout

[SeanBryan51]

The chdir context manager should log to stdout in verbose mode when changing directories:

benchcab/benchcab/utils/fs.py

Lines 9 to 17 in b5fe7fd

	@contextlib.contextmanager
	def chdir(newdir: Path):
	"""Context manager `cd`."""
	prevdir = Path.cwd()
	os.chdir(newdir.expanduser())
	try:
	yield
	finally:
	os.chdir(prevdir)