conflicts(names) {
    this.conflictsWith = this.conflictsWith.concat(names);
    return this;
  }
Add option name(s) that conflict with this option.
An error will be displayed if conflicting options are found during parsing.

@example
new Option('--rgb').conflicts('cmyk');
new Option('--js').conflicts(['ts', 'jsx']);

@param {(string | string[])} names
@return {Option}