Fix misplaced full stop in ScriptHandler

Author: jnoordsij

Diff for: scripts/composer/ScriptHandler.php

@@ -97,7 +97,7 @@ public static function checkComposerVersion(Event $event) {
       $io->writeError('<warning>You are running a development version of Composer. If you experience problems, please update Composer to the latest stable version.</warning>');
     }
     elseif (Comparator::lessThan($version, '2.3.6')) {
-      $io->writeError('<error>Drupal-project requires Composer version 2.3.6 or higher. Please update your Composer before continuing</error>.');
+      $io->writeError('<error>Drupal-project requires Composer version 2.3.6 or higher. Please update your Composer before continuing.</error>');
       exit(1);
     }
   }