Fix coding style according to StyleCI

Author: mnphpexpert

src/Jenssegers/Mongodb/Connection.php

@@ -136,10 +136,11 @@ protected function createConnection($dsn, array $config, array $options)
             $driverOptions = $config['driver_options'];
         }
 
-        if (!isset($options['username'])){
+        // Check if the credentials are not already set in the options
+        if (!isset($options['username'])) {
             $options['username'] = isset($config['username']) ? $config['username'] : '';
         }
-        if (!isset($options['password'])){
+        if (!isset($options['password'])) {
             $options['password'] = isset($config['password']) ? $config['password'] : '';
         }