App: Avoid to generate a key contain the letters: l, 1, I

[Kelvin You]

If the letters [l, 1, I] are in the same key, for some fonts, it's difficult to distinguish them. So please avoid to generate the key contains [l, 1, I] or you can show the key with a clear font.

[Peter]

Dear Kevin,

thanks for this great app! I used the old version, now installed the new one, but it still gives I or L characters upon the key generation. Do i miss something?