Update implementations.md

promises-aplus / promises-spec

An open standard for sound, interoperable JavaScript promises—by implementers, for implementers.

https://promisesaplus.com/

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Closed onmyway133 closed 8 years ago

onmyway133 commented 8 years ago

Add FutureLib and Then, Swift implementation

domenic commented 8 years ago

Thanks! Merged as 5b0852beb47c0cf9b1edaa7c977e4f81cdef319f.