Max puzzle size is 25, not 30

[dt215git]

Docs state max puzzle size is 30, but this isn't consistent with what's in config.py.

# puzzle settings
min_puzzle_size = 10
max_puzzle_size = 25
min_puzzle_words = 1
max_puzzle_words = 30
max_fit_tries = 100

At least it's an easy fix 😁 Nice little tool this 👍

[joshbduncan]

Hey, thanks for catching that! I wish all fixes were this easy 😬. I've got the docs updated and a new version coming out. Cheers ✌️