tests/unwrap-message-id.py

summary: migrate `opts` to native kwargs

This has the added benefit of unconfusing PyCharm- it thought `opts` in the
nested functions were str based for some reason.

import sys

for line in sys.stdin:
    if line.lower() in ("message-id: \n", "in-reply-to: \n"):
        line = line[:-2]
    print(line, end="")