remove CountOnNullRector from skip list as now deprecated

Author: samsonasik

rector.php

@@ -35,7 +35,6 @@
 use Rector\EarlyReturn\Rector\Return_\PreparedValueToEarlyReturnRector;
 use Rector\Php55\Rector\String_\StringClassNameToClassConstantRector;
 use Rector\Php70\Rector\FuncCall\RandomFunctionRector;
-use Rector\Php71\Rector\FuncCall\CountOnNullRector;
 use Rector\Php73\Rector\FuncCall\JsonThrowOnErrorRector;
 use Rector\PHPUnit\CodeQuality\Rector\Class_\YieldDataProviderRector;
 use Rector\PHPUnit\Set\PHPUnitSetList;
@@ -105,9 +104,6 @@
             __DIR__ . '/system/Session/Handlers',
         ],
 
-        // sometime too detail
-        CountOnNullRector::class,
-
         // use mt_rand instead of random_int on purpose on non-cryptographically random
         RandomFunctionRector::class,