Post-jam bugfix

I have updated the game with a bugfix, now that the week after the jam reserved for ratings is ended and I'm allowed to update the game.

(Previously, there was a rare bug causing invalid words to be created by adding letters to an existing word. It was rare enough that fixing it shouldn't much affect the distribution of typical scores. Details at https://github.com/charlescapps/ProScrabble/pull/1. Of course, there are also many valid but obscure words that few people recognize. The full list of valid words can be downloaded from the git repository.)

A Bag Deal is on GitHub at https://github.com/jamie-hello/game-by-jamie-and-xom