Change hash substring to be 26 characters instead of 20.
Change hash substring to be 26 characters instead of 20.

Cleverbot released an update that requires the first 26 characters after `stimulus=` in the post body to be hashed for the `incognocheck` parameter. Previously it only required the first 20, however if you only hash 20 characters, you end up getting 'DENIED' back for the session ID.

This solves issue #2.
fojas/cleverbot-node