Enable Tables accessors

[malmaud]

Fixes #70

[codecov-commenter]

Codecov Report

Merging #80 (6b41a02) into master (a5de59e) will increase coverage by 0.44%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #80      +/-   ##
==========================================
+ Coverage   63.75%   64.19%   +0.44%     
==========================================
  Files           5        5              
  Lines         240      243       +3     
==========================================
+ Hits          153      156       +3     
  Misses         87       87              

Flag	Coverage Δ
unittests	64.19% <100.00%> (+0.44%)	⬆️

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

Impacted Files	Coverage Δ
src/tables.jl	88.88% <100.00%> (+5.55%)	⬆️

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