Update README.rst

[mflpopescu]

Correcting filename where DELTAFETCH_ENABLED = True configuration needs to be added from setting.py to settings.py

[codecov]

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@@            Coverage Diff            @@
##             master      #35   +/-   ##
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  Coverage          ?   91.30%           
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  Files             ?        2           
  Lines             ?       69           
  Branches          ?        9           
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  Hits              ?       63           
  Misses            ?        3           
  Partials          ?        3           

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[pawelmhm]

thanks very much for this @mflpopescu