p5-String-Util: update to 1.31.

1.31  2020-07-27 10:28:07 PDT

- Deprecate randcrypt() as it's not secure in 2020

- Add file_get_contents()

- Make trim() unicode friendly

1.30  2020-07-23 14:29:05 PDT

- Ownership transferred to Scott Baker

- Removed undocumented function: spacepad()

- Added a new sanitize() function

- Deprecated some older functions: crunch(), fullchomp(), define(), and cellfill()

(wiz)