Updated example base header (Fixes #144)

base/vulkanexamplebase.h

@@ -63,6 +63,7 @@ protected:
 	float frameTimer = 1.0f;
 	// Frame counter to display fps
 	uint32_t frameCounter = 0;
+	uint32_t lastFPS = 0.0f;
 	// Vulkan instance, stores all per-application states
 	VkInstance instance;
 	// Physical device (GPU) that Vulkan will ise