Import coverage setting from ndarray-stats

[termoshtt]

As discussed in rust-ndarray#641

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@5c2da21). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #1   +/-   ##
=========================================
  Coverage          ?   90.89%           
=========================================
  Files             ?       50           
  Lines             ?     4866           
  Branches          ?        0           
=========================================
  Hits              ?     4423           
  Misses            ?      443           
  Partials          ?        0

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