Add Base.hash(::Measurement, ::UInt) method

[giordano]

Fixes #103.

[codecov-commenter]

Codecov Report

Merging #104 (37f91d6) into master (cbda13d) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 37f91d6 differs from pull request most recent head 6d3da57. Consider uploading reports for the commit 6d3da57 to get more accurate results

@@           Coverage Diff           @@
##           master     #104   +/-   ##
=======================================
  Coverage   96.84%   96.84%           
=======================================
  Files          12       12           
  Lines         697      698    +1     
=======================================
+ Hits          675      676    +1     
  Misses         22       22           

Impacted Files	Coverage Δ
src/comparisons-tests.jl	100.00% <100.00%> (ø)

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