Clean out files that should not be pushed to git for composer publish

vendor/nikic/php-parser/lib/PhpParser/ErrorHandler/Throwing.php

@@ -1,18 +0,0 @@
-<?php declare(strict_types=1);
-
-namespace PhpParser\ErrorHandler;
-
-use PhpParser\Error;
-use PhpParser\ErrorHandler;
-
-/**
- * Error handler that handles all errors by throwing them.
- *
- * This is the default strategy used by all components.
- */
-class Throwing implements ErrorHandler
-{
-    public function handleError(Error $error) {
-        throw $error;
-    }
-}