composer.json: allow-polyfill-parser in phan

Author: reedy

composer.json

@@ -44,7 +44,7 @@
             "phpunit --log-junit=reports/unitreport.xml --coverage-text --coverage-html=reports/coverage --coverage-clover=reports/coverage.xml",
             "phpcs --encoding=utf-8 --standard=PSR2 --report-checkstyle=reports/checkstyle-phpcs.xml --report-full --extensions=php src/* tests/phpunit/*"
         ],
-        "phan": "phan -d . --long-progress-bar",
+        "phan": "phan -d . --long-progress-bar --allow-polyfill-parser",
         "phpcs": "phpcs --encoding=utf-8 --standard=PSR2 --extensions=php src/* tests/phpunit/*",
         "phpunit": "phpunit",
         "test": [