Random extensions for Range class.
Return a random element from the range.
(1..4).at_rand #~> 2 (1..4).at_rand #~> 4 (1.5..2.5).at_rand #~> 2.06309842754533 (1.5..2.5).at_rand #~> 1.74976944931541 ('a'..'z').at_rand #~> 'q' ('a'..'z').at_rand #~> 'f'
CREDIT: Lavir the Whiolet, Thomas Sawyer
[Validate]