Call KNe light curves from gwemlightcurves

[mcoughlin]

Can use KNe function from gwemlightcurves to produce lightcurves.

Fixes #33 .

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@1eb60ed). Click here to learn what that means.
The diff coverage is 50.00%.

@@            Coverage Diff            @@
##             master      #37   +/-   ##
=========================================
  Coverage          ?   21.45%           
=========================================
  Files             ?       25           
  Lines             ?     1622           
  Branches          ?        0           
=========================================
  Hits              ?      348           
  Misses            ?     1274           
  Partials          ?        0           

Impacted Files	Coverage Δ
dorado/scheduling/metrics/kne.py	18.88% <50.00%> (ø)

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[mcoughlin]

Unit tests pass. Merging.