code: @Override
      public SendInvitation invitees(ApiBaseUser... users) {
          this.invitees.addAll(Arrays.asList(users));
          return this;
      }
docs: /* (non-Javadoc)
  @see com.tvd12.ezyfox.core.command.SendInvitation#invitees(com.tvd12.ezyfox.core.entities.ApiBaseUser[])