Fix the deprecation problem of idn_to_ascii() since php7.2 #1505
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idn_to_ascii() php function is deprecated as of php 7.2
![image](https://user-images.githubusercontent.com/5228893/111969833-f0b84f80-8afa-11eb-9081-f12fff405b50.png)
However it is still available but you should use INTL_IDNA_VARIANT_UTS46 as a third argument. (see https://www.php.net/manual/en/function.idn-to-ascii.php)
Otherwise you will see the error because INTL_IDNA_VARIANT_2003 is deprecated.
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