added support for two dimensional variables

[fullergalway]

Hi,

Useful project, thanks.

I wanted to read some ichthyop output files, but encountered a problem retrieving data for the two dimensional lat and lon data variables. I added a test case and resolved.

This may address #6?

Kind regards,
Rob Fuller,
on behalf of Irish Marine Institute

[codecov-io]

Codecov Report

Merging #9 into master will increase coverage by 3.56%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
+ Coverage    88.1%   91.66%   +3.56%     
==========================================
  Files           5        5              
  Lines         227      228       +1     
  Branches       38       39       +1     
==========================================
+ Hits          200      209       +9     
+ Misses         27       19       -8

Impacted Files	Coverage Δ
src/data.js	100% <100%> (ø)	⬆️
src/types.js	84.81% <0%> (+10.12%)	⬆️

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[maasencioh]

Hello @fullergalway,

Thank you so much for your contribution, I also have the impression that is related to it but I'll test if it solves the issue.