Use the scientific name if no generic name is present

[tpoisot]

Closes #27

[codecov]

Codecov Report

Merging #28 into master will decrease coverage by 0.38%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
- Coverage   78.76%   78.37%   -0.39%     
==========================================
  Files          10       10              
  Lines         146      148       +2     
==========================================
+ Hits          115      116       +1     
- Misses         31       32       +1     

Flag	Coverage Δ
#unittests	78.37% <80.00%> (-0.39%)	⬇️

Impacted Files	Coverage Δ
src/types/GBIFRecords.jl	86.36% <80.00%> (-3.64%)	⬇️

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