Bump rustyline version to 9.0

Author: notmandatory

Cargo.lock

@@ -21,7 +21,7 @@ base64 = "^0.11"
 zeroize = { version = "<1.4.0" }
 
 # Optional dependencies
-rustyline = { version = "6.0", optional = true }
+rustyline = { version = "9.0", optional = true }
 dirs-next = { version = "2.0", optional = true }
 env_logger = { version = "0.7", optional = true }
 clap = { version = "2.33", optional = true }