title: 'ToastNotifier' object has no attribute 'classAtom'
body: <p>I ran the code below;</p>
  
  <pre><code>from win10toast import ToastNotifier
  toaster = ToastNotifier()
  toaster.show_toast("Hello World!!!",
                     "Python is 10 seconds awsm!",
                     icon_path="custom.ico",
                     duration=10)
  </code></pre>
  
  <p>I am getting below error :</p>
  
  <pre><code>  File "C:\Users\jnp\AppData\Local\Continuum\anaconda3\lib\site-packages\win10toast\__init__.py", line 83, in _show_toast
  self.hwnd = CreateWindow(self.classAtom, "Taskbar", style,
  
  AttributeError: 'ToastNotifier' object has no attribute 'classAtom'
  </code></pre>