Update README.md

Lewiscowles1986 · Aug 2, 2016 · fafcb80 · fafcb80
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 # ulid
 Universally Unique Lexicographically Sortable Identifier ported to PHP
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+Tests borrowed from [.NET port](https://github.com/fvilers/ulid.net)
+Original idea borrowed from [JS](https://github.com/alizain/ulid)
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+License AGPL