Include docs in source distributions, fixes #39

[sbraz]

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[codecov-io]

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@@           Coverage Diff           @@
##             master    #40   +/-   ##
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  Coverage          ?   100%           
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  Files             ?      1           
  Lines             ?     83           
  Branches          ?     16           
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  Hits              ?     83           
  Misses            ?      0           
  Partials          ?      0

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