Fix build failure with SimpleKeychain 0.11.0. (#354)

* Fix build failure with SimpleKeychain 0.11.0.

* Trigger new CI build

* Unwrap optional

* Extract logic to private method

* Add iOS 9 test case

* Revert changes

Co-authored-by: Rita Zerrizuela <[email protected]>

Author: jshier

Auth0/JWK+RSA.swift

@@ -37,7 +37,7 @@ extension JWK {
         let tag = "com.auth0.tmp.RSAPublicKey"
         let keychain = A0SimpleKeychain()
         guard keychain.setRSAPublicKey(data: encodedKey, forKey: tag) else { return nil }
-        return keychain.keyRefOfRSAKey(withTag: tag).takeRetainedValue()
+        return keychain.keyRefOfRSAKey(withTag: tag)?.takeRetainedValue()
     }
 
     private func encodeRSAPublicKey(modulus: [UInt8], exponent: [UInt8]) -> Data {

Cartfile.resolved

@@ -2,4 +2,4 @@ github "AliSoftware/OHHTTPStubs" "8.0.0"
 github "Quick/Nimble" "v8.0.5"
 github "Quick/Quick" "v2.2.0"
 github "auth0/JWTDecode.swift" "2.4.1"
-github "auth0/SimpleKeychain" "0.9.0"
+github "auth0/SimpleKeychain" "0.11.0"