Fix QT5 build(error in shutdown command)

Author: Andrii Boichuk

src/Test/shutdown_command.cc

@@ -1,7 +1,14 @@
 #include "shutdown_command.h"
 #include <iostream>
 #include "webdriver_server.h"
+
 #include <QtGui/QApplication>
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
+    #include <QtConcurrent/QtConcurrentRun>
+    #include <QtWidgets/QApplication>
+#else
+    #include <QtGui/QApplication>
+#endif
 
 namespace webdriver {