phpdoc-parser
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Fix PHPUnit errors
The (travis-ci) unit tests are failing because not all PHPUnit versions are compatible with the WP_UnitTestCase class from WordPress.
This pull requests replaces the hard coded WP version (4.3) with the latest WP version by calling the WordPress API. It then installs the correct PHPUnit version depending on the PHP version. PHPUnit 7 is not yet supported. See ticket #43218.
The errors discussed in issue #206 are because the nikic/php-parser v1.2.0+ doesn't use magic getters anymore. This is fixed by checking if the property exist before referencing it.
This PR also removes testing for hhvm as that's no longer needed in my opinion.