a minor error in code

[eveliao]

in chapterize.py line 173
endLocation = len(self.lines)-1 # The end

I think it's better set as len(self.lines)
because if we can't detect the end location, the last line could possibly be part of the book and shouldn't be removed.

[JonathanReeve]

To be honest, I don't really remember why I wrote it like that. It could very well be a mistake. If you'd like to submit a pull request, and test it against a few texts to make sure it works, I'd be happy to review it.

[Ingrid-0906]

Hey, Sailors! Just a tip.
I removed the -1 from line 173 -> [ endLocation = len(self.lines)-1 ] and i got an error of index out of range.
Then, i applied again the -1 and it flowed like a charm! In summary, guys don't remove the -1, or the index error will pop over line 16 -> [headingsPlain = [self.lines[loc] for loc in self.headingLocations] ]