// usage
chance.letter()
chance.letter({ casing: 'lower' })
Return a random letter.
chance.letter();
=> 'p'
By default it will return a random lowercase letter.
Note, wanted to call this option just case instead of casing but unfortunately that's a reserved word in JavaScript for use in a switch statement
It's possible to specify upper case
chance.letter({casing: 'upper'});
=> 'A'