Generate number and prompt

- generate random number b/t 1 and 10
- prompt user to guess what it is
Tell User whether guess is correct or not
Allow 3 guesses before revealing correct number.
Gives higher or lower hint on an incorrect guess.
Changed "higher_lower" to "hint" - makes more sense
Added validation
Allow User to define the max range
Guesses count down instead of up now
Add more bonus stuff

- Scale guesses
- Play again?