refactor README

README.md

@@ -32,8 +32,9 @@ fun main() {
     )
 
     // generate and verify OTP
-    val now = System.now()
-    val otp = totp.generate(<secret>, now)
-    totp.verify(<secret>, now, otp)
+    val secret = "...".encodeToByteArray()
+    val time = System.now()
+    val otp = totp.generate(secret, time)
+    totp.verify(secret, time, otp)
 }
 ```