patch to add species routine to work with new updates

[andrewkern]

patch to maintenance add_species routine. new updates to the way we pull data from ensembl broke this routine.

should close #1670

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.85%. Comparing base (cb1550a) to head (ea970d2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1671   +/-   ##
=======================================
  Coverage   99.85%   99.85%           
=======================================
  Files         136      136           
  Lines        4671     4671           
  Branches      470      470           
=======================================
  Hits         4664     4664           
  Misses          3        3           
  Partials        4        4           

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[petrelharp]

LGTM, and it seems to fix the problem!