Add `clean` and `isvalid` funnctions

• add clean, isvalid, invalidposition functions
• add fuzzing test

thansk for @alexdowad

Update Unicode Standard to 15.0

0.1.4

release new version to luarocks

Bugfix Release

make a new release for #31, changes:

• update Unicode version to 14
• Fix compile error on CentOS6

Bugfix release

This is a bugfix release, as I don't have much time/idea for new feature of this project.

release 0.1.1

fix encode/decode large code point issue.

release 0.1.0-1

release 0.1.0