v1.1.1 / 2017-03-07 [Change] Use Integer instead fo Fixnum for integer check v1.1.0 / 2014-10-01 [Feature] Support the byte-length mode v1.0.2 / 2014-09-30 [Dependence] Use new unit test syntex for testing, require minitest ~> 5.0 [Change] Use "SecureRandom.random_number" instead of "rand"