Log Message:
security/ruby-rex-text: update to 0.2.21

0.2.17 (2018-02-09)

* Land #9, remove use of 'fun' keyword
* Land #10, add rand_country

0.2.18 (2018-04-12)

* Land #11, ranges for rand_base and rand_text_*

0.2.19 (2018-04-18)

* Land #13, add text encryption / encoding wrappers

0.2.20 (2018-04-18)

* Land #14, remove RC4/SHA256 support
* Land #12, bump ruby deps

0.2.21 (2018-06-13)

* Land #16, simplify shuffle_a implementation
* Land #17, speedup to_mixed_case_array
* Land #18, use single regular expression for strict case
* Land #19, remove unnecessary gsub regex to remove newline
* Land #21, add SHA2 digest wrappers