Method alias

src/command.ts:84–87

* Sets an alias for a command. * @param aliases an alternativre name for the command. Users will be able to call the command via this name. * @return the command, for chaining.

(alias: string)

   * @return the command, for chaining.
   */
  alias(alias: string): Command {
    this.aliases.push(alias);
    return this;
  }

  /**
   * Sets any options for the command.