title: KeyError when using Pynsist
body: <p>I'm trying to replicate the following example: <a href="https://github.com/takluyver/pynsist/tree/master/examples/tkinter" rel="nofollow noreferrer">https://github.com/takluyver/pynsist/tree/master/examples/tkinter</a> but it is not working. I have a python file and .cfg that are copy pasted from here, but when I run <code>py -m nsist installer.cfg</code> on my command prompt, I get the following error: </p>
  
  <pre><code>C:\Users\Mike\Desktop&gt;py -m nsist installer.cfg
  Traceback (most recent call last):
    File "C:\Users\Mike\AppData\Local\Programs\Python\Python36-32\lib\runpy.py", line 193, in _run_module_as_main
      "__main__", mod_spec)
    File "C:\Users\Mike\AppData\Local\Programs\Python\Python36-32\lib\runpy.py", line 85, in _run_code
      exec(code, run_globals)
    File "C:\Users\Mike\AppData\Local\Programs\Python\Python36-32\lib\site-packages\nsist\__main__.py", line 2, in &lt;module&gt;
      main()
    File "C:\Users\Mike\AppData\Local\Programs\Python\Python36-32\lib\site-packages\nsist\__init__.py", line 527, in main
      shortcuts = configreader.read_shortcuts_config(cfg)
    File "C:\Users\Mike\AppData\Local\Programs\Python\Python36-32\lib\site-packages\nsist\configreader.py", line 182, in read_shortcuts_config
      appcfg = cfg['Application']
    File "C:\Users\Mike\AppData\Local\Programs\Python\Python36-32\lib\configparser.py", line 956, in __getitem__
      raise KeyError(key)
  KeyError: 'Application'
  </code></pre>
  
  <p>I am running this from Python 3.6.0 on Windows 10 64-bit.</p>