change conda newick name; closes #2159

[petrelharp]

Thanks for the report!

[codecov]

Codecov Report

Merging #2160 (f166491) into main (d05b851) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2160   +/-   ##
=======================================
  Coverage   91.45%   91.45%           
=======================================
  Files          20       20           
  Lines       11170    11170           
  Branches     2268     2268           
=======================================
  Hits        10216    10216           
  Misses        521      521           
  Partials      433      433           

Flag	Coverage Δ
C	91.45% <ø> (ø)
python	98.74% <ø> (ø)

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Impacted Files	Coverage Δ
msprime/species_trees.py	99.55% <ø> (ø)

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