Updating readme referencing the Active Internet-Draft

jcagarcia · Nov 21, 2023 · 88af4b4 · 88af4b4
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 Gem for supporting idempotency in your [Grape](https://github.com/ruby-grape/grape) APIs.
 
+Implementation based on the Active Internet-Draft [draft-ietf-httpapi-idempotency-key-header-04](https://datatracker.ietf.org/doc/draft-ietf-httpapi-idempotency-key-header/04/)
+
 Topics covered in this README:
 
 - [Installation](#installation-)