feat(dictionary): add withKeys (cxmeel#13)

Co-authored-by: csqrl <21029087+csqrl@users.noreply.github.com>

Update README.md

Implement `Array.is` (cxmeel#8)

Fix critical bug in Sift.Dictionary.update (cxmeel#7)

Update insert.lua

Fix indentation because moonwave is fussy.

TypeScript support (cxmeel#2)

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