W3C switchToWindow takes a handle

The W3C specification dictates that the parameter used to select the
window should be named `handle`.

Source: https://www.w3.org/TR/webdriver/#switch-to-window

Author: andrewnicols

lib/Remote/RemoteTargetLocator.php

@@ -89,7 +89,12 @@ public function frame($frame)
      */
     public function window($handle)
     {
-        $params = ['name' => (string) $handle];
+        if ($this->isW3cCompliant) {
+            $params = ['handle' => (string) $handle];
+        } else {
+            $params = ['name' => (string) $handle];
+        }
+
         $this->executor->execute(DriverCommand::SWITCH_TO_WINDOW, $params);
 
         return $this->driver;