Use dotorg readme parser if available

[ernilambar]

This PR:

• If WordPressdotorg\Plugin_Directory\Readme\Parser class is available, use it for parsing readme. Otherwise use WordPress\Plugin_Check\Lib\Readme\Parser

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[dd32]

Haven't tested this, but looks like it'll work just fine for the intended purpose.

I got to thinking the WordPress.org plugin directory could probably do something like class_alias( '\WordPressdotorg\Plugin_Directory\Readme\Parser', '\WordPress\Plugin_Check\Lib\Readme\Parser' ); to override PCP :)

Probably best to do this on the PCP side though, as that'll leave the door open for a future where you need to use a custom parser for some reason..

I'll also have to remember to use class_exists( ImportedClassName::class ) :)