Correct quoting of measurements

[simeonschaub]

This corrects the printing of measurements in expressions, like :(2 * (1 ± .2)).

[giordano]

Does this depend on #56?

[simeonschaub]

No, this is unrelated. (The reason range is in there is that I first thought ranges had to be quoted to, but that's not the case. Might test if their representation is parseable while we're at it, anyways.)

[codecov-io]

Codecov Report

Merging #57 into master will decrease coverage by 0.14%.
The diff coverage is 80%.

@@            Coverage Diff             @@
##           master      #57      +/-   ##
==========================================
- Coverage   96.32%   96.17%   -0.15%     
==========================================
  Files          12       12              
  Lines         544      549       +5     
==========================================
+ Hits          524      528       +4     
- Misses         20       21       +1

Impacted Files	Coverage Δ
src/show.jl	73.68% <80%> (+0.95%)	⬆️

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