[wp-meta] [Making WordPress.org] #7749: Convert assignment statement in Parser class to make compatible to PHP 7.2

[Making WordPress.org]

#7749: Convert assignment statement in Parser class to make compatible to PHP 7.2
------------------------------+--------------------
 Reporter:  rabmalin          |      Owner:  (none)
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:
Component:  Plugin Directory  |   Keywords:
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 We are using Readme Parser class in a plugin whose minimum supported PHP
 is 7.2.

 In this class, following in the only statement which is not supported in
 PHP 7.2

 I am creating this ticket requesting to rewrite following line of code to
 make it compatible to PHP 7.2


 {{{
 $this->warnings['contributor_ignored'] ??= [];
 }}}

 Ref:
 https://github.com/WordPress/wordpress.org/blob/trunk/wordpress.org/public_html
 /wp-content/plugins/plugin-directory/readme/class-parser.php#L715

 {{{
 The null coalesce equal operator (??=) is not present in PHP version 7.3
 or earlier (PHPCompatibility.Operators.NewOperators.t_coalesce_equalFound)
 }}}

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Ticket URL: <https://meta.trac.wordpress.org/ticket/7749>
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