Mention ignored JWK parameters in readme (#118)

* Mention ignored JWK parameters in readme

* Add explicit link to #117 in readme

README.md

@@ -307,6 +307,8 @@ let publicKey: SecKey = try! jwk.converted(to: SecKey.self)
 
 More details about decoding RSA public keys can be found [in the wiki](../../wiki/jwk).
 
+:warning: We currently ignore the key parameters [`"key_ops"`](https://tools.ietf.org/html/rfc7517#section-4.3) and [`"x5c"`](https://tools.ietf.org/html/rfc7517#section-4.7) when decoding. This is due to a bug in our decoding implementation. See [#117](https://github.com/airsidemobile/JOSESwift/issues/117) for details.
+
 ## Security
 
 JOSESwift uses the [iOS Security framework](https://developer.apple.com/documentation/security) and [Apple’s CommonCrypto](https://opensource.apple.com//source/CommonCrypto/) for cryptography.