trim() input string of .arguments method

Author: Felarn

lib/command.js

@@ -330,7 +330,7 @@ class Command extends EventEmitter {
    */
 
   arguments(names) {
-    names.split(/ +/).forEach((detail) => {
+    names.trim().split(/ +/).forEach((detail) => {
       this.argument(detail);
     });
     return this;