compatible with php 7.2 and fix error idn_to_ascii(): INTL_IDNA_VARIANT_2003 is deprecated
in PHP 7.2
#30
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Hi
In old version of league/uri it use some deprecated function such as idn_to_ascii that is fix after this PR. so I only update it.
And unfortunately in php 7.2 we have another error for this bug/pr, so I add TODO that remeber it in future to update it.