Add void return type hint for MonologCollector::write() (php-debugbar#427)

The method signature has changed in v2. The diff: Seldaek/monolog@1.25.1...2.0.0#diff-d1d031ebe96084844fb53eb650bc404eR50

Author: ekateiva

src/DebugBar/Bridge/MonologCollector.php

@@ -59,7 +59,7 @@ public function addLogger(Logger $logger)
     /**
      * @param array $record
      */
-    protected function write(array $record)
+    protected function write(array $record): void
     {
         $this->records[] = array(
             'message' => $record['formatted'],