Added scikit-learn to environment.yml

[alongd]

to be compatible with RMG

[codecov]

Codecov Report

Merging #116 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #116   +/-   ##
=======================================
  Coverage   40.14%   40.14%           
=======================================
  Files          22       22           
  Lines        5517     5517           
  Branches     1453     1453           
=======================================
  Hits         2215     2215           
+ Misses       2946     2944    -2     
- Partials      356      358    +2

Impacted Files	Coverage Δ
arc/reaction.py	41.47% <0%> (ø)	⬆️

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