fix phpstan issues

Author: Gared

src/Console/GenerateFileHashesAllVersionsCommand.php

@@ -116,7 +116,7 @@ private function scanVersionInstances(array $allInstances, string $version, stri
             $instanceResult = new InstanceResult($instance['name'], $version, $fileHash, $fileContent);
             $instanceResults->add($instanceResult);
 
-            if ($fileHash === null) {
+            if ($instanceResult->fileHash === null) {
                 $output->writeln('<error>Could not get hash for instance ' . $instance['name'] . '</error>', OutputInterface::VERBOSITY_VERY_VERBOSE);
 
                 if ($scannedInstances > 4 && count($foundMatchesForHash) === 0) {

src/Console/InstanceResult.php

@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 namespace Gared\EtherScan\Console;
 

src/Console/InstanceResults.php

@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 namespace Gared\EtherScan\Console;