Update README.md

Author: brendan-rius

README.md

@@ -26,7 +26,7 @@ make OPENSSL=/usr/local/opt/openssl/include OPENSSL_LIB=-L/usr/local/opt/openssl
 $ > ./jwtcrack eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.cAOIAifu3fykvhkHpbuhbvtH807-Z2rI1FS3vX1XMjE
 ```
 
-In the above example, the key is `Sn1f`. It takes approximately 23 seconds to crack on my Macbook.
+In the above example, the key is `Sn1f`. It takes approximately 2 seconds to crack on my Macbook.
 
 ## Caveats