Added value and uncertainty for Measurements w/ Units

[simeonschaub]

No description provided.

[giordano]

Cool, thanks! This will make some tests in PhysicalConstants.jl easier, like this one 😉

[codecov-io]

Codecov Report

Merging #37 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
+ Coverage   96.61%   96.63%   +0.02%     
==========================================
  Files           9        9              
  Lines         531      535       +4     
==========================================
+ Hits          513      517       +4     
  Misses         18       18

Impacted Files	Coverage Δ
src/Measurements.jl	92.85% <100%> (+1.19%)	⬆️

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