Add [] as an alternative to get

[davidanthoff]

Closes #16.

[codecov-io]

Codecov Report

Merging #20 into master will increase coverage by 0.31%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
+ Coverage   51.29%   51.61%   +0.31%     
==========================================
  Files           4        4              
  Lines         154      155       +1     
==========================================
+ Hits           79       80       +1     
  Misses         75       75

Impacted Files	Coverage Δ
src/DataValues.jl	76.19% <100%> (+0.22%)	⬆️

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