Replace django-admin.py with django-admin

[rdmolony]

Running on Django v1.11.25 ...

django-admin.py startproject superlists .

... opens the file django-admin.py

Whereas running ...

django-admin startproject superlists . 

... runs as expected generating a new project called superlists

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As someone who's just starting a new job on a Django system, I'm extremely grateful that this book exists. I'm finding it extremely useful, and am really enjoying reading it (I read ahead without coding along - a grave mistake!) in spite of the fact that its a technical book. Thanks a lot Harry for dedicating a vast amount of time towards writing this!