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

vendor/nikic/php-parser/grammar/tokens.template

@@ -1,17 +0,0 @@
-<?php
-$meta #
-#semval($) $this->semValue
-#semval($,%t) $this->semValue
-#semval(%n) $this->stackPos-(%l-%n)
-#semval(%n,%t) $this->stackPos-(%l-%n)
-
-namespace PhpParser\Parser;
-#include;
-
-/* GENERATED file based on grammar/tokens.y */
-final class Tokens
-{
-#tokenval
-    const %s = %n;
-#endtokenval
-}