Update README.md (#41)

Author: pdgonzalez872

README.md

@@ -135,7 +135,7 @@ MyApp.Knock.client()
 
 ### Signing JWTs
 
-You can use the excellent `joken` package to [sign JWTs easily](https://hexdocs.pm/joken/assymetric_cryptography_signers.html#using-asymmetric-algorithms).
+You can use the excellent `joken` package to [sign JWTs easily](https://hexdocs.pm/joken/asymmetric_cryptography_signers.html#using-asymmetric-algorithms).
 You will need to generate an environment specific signing key, which you can find in the Knock dashboard.
 
 If you're using a signing token you will need to pass this to your client to perform authentication.