✨ add latitudes for single GBIF record

[tpoisot]

What the pull request does

Closes #62 by adding a latitudes and longitudes method for GBIFRecord -- this is used internally by the latitudes and longitudes methods for GBIFRecords.

[codecov-io]

Codecov Report

Merging #63 (4df5aa0) into master (48fe81c) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master      #63   +/-   ##
=======================================
  Coverage   85.26%   85.26%           
=======================================
  Files          22       22           
  Lines         475      475           
=======================================
  Hits          405      405           
  Misses         70       70           

Flag	Coverage Δ
unittests	85.26% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/integrations/GBIF.jl	78.57% <0.00%> (ø)

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