update for new possible_values syntax

Author: samkim-crypto

token/cli/src/clap_app.rs

@@ -1252,7 +1252,7 @@ pub fn app<'a, 'b>(
                     Arg::with_name("authority_type")
                         .value_name("AUTHORITY_TYPE")
                         .takes_value(true)
-                        .possible_values(&CliAuthorityType::iter().map(Into::into).collect::<Vec<_>>())
+                        .possible_values(&CliAuthorityType::iter().map(Into::<&str>::into).collect::<Vec<_>>())
                         .index(2)
                         .required(true)
                         .help("The new authority type. \