Fix variable displaying in REPL

[HarrisonGrodin]

Fixes #129.

[codecov]

Codecov Report

Merging #131 into master will decrease coverage by 0.5%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #131      +/-   ##
==========================================
- Coverage   94.39%   93.88%   -0.51%     
==========================================
  Files          11       11              
  Lines         357      360       +3     
==========================================
+ Hits          337      338       +1     
- Misses         20       22       +2

Impacted Files	Coverage Δ
src/variables.jl	91.42% <33.33%> (-5.45%)	⬇️

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