update rockspec

Merge pull request #19 from kmarius/update-unicode

update to unicode 15.0.0

Update README.md

Merge pull request #5 from kmarius/unicode

support unicode

Merge pull request #7 from nathanrpage97/feat/support-multiple-lua-ve…

…rsions

Support multiple lua versions + CI test

Merge pull request #6 from kmarius/inclusive-index

Inclusive index

Merge pull request #2 from L3MON4D3/master

skip one character on empty match.