Add scipy to setup.py

[rly]

setup.py needs to list the new requirement scipy

[codecov]

Codecov Report

Merging #151 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #151   +/-   ##
=======================================
  Coverage   69.75%   69.75%           
=======================================
  Files          29       29           
  Lines        5736     5736           
  Branches     1352     1352           
=======================================
  Hits         4001     4001           
  Misses       1307     1307           
  Partials      428      428

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