Parse a subtitles file, replace every line with some text, write the result into a new subtitles file.
Usage
# Show usage info
blah --help
# Replace every line with "blah blah"
blah -i original.srt -o blahblah.srt -t "blah blah"
# Replace the lines in each subtitle with a beautiful diamond made of '+'
# +
# +++
# +++++
# +++
# +
blah -i original.srt -o diamonds.srt -1 "+" -2 "+++" -3 "+++++" -4 "+++" -5 "+"