Reverse hasCoreVersionRequirement() conditional

Author: lkmorlan

src/Writer/Drupal.php

@@ -41,7 +41,7 @@ public function rewrite($version, $timestamp, $core = null, $project = null)
             // Don't write to files that already contain version information.
             if (!$this->hasVersionInfo($info_file)) {
                 $file = fopen($info_file, 'a+');
-                $coreToWrite = $this->hasCoreVersionRequirement($info_file) ? $core : null;
+                $coreToWrite = $this->hasCoreVersionRequirement($info_file) ? null : $core;
                 fwrite($file, $this->formatInfo($version, $timestamp, $coreToWrite, $project));
                 fclose($file);
             }