choice argument type

commands/text-edit/base64.js

@@ -15,12 +15,8 @@ module.exports = class Base64Command extends Command {
 				{
 					key: 'mode',
 					prompt: `Would you like to ${list(modes, 'or')}?`,
-					type: 'string',
-					validate: mode => {
-						if (modes.includes(mode.toLowerCase())) return true;
-						return `Invalid mode, please enter either ${list(modes, 'or')}.`;
-					},
-					parse: mode => mode.toLowerCase()
+					type: 'choice',
+					choices: modes
 				},
 				{
 					key: 'text',