Create observer for Assay in DiffStatTable.

[LTLA]

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[codecov-io]

Codecov Report

Merging #30 into master will not change coverage by %.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master      #30   +/-   ##
=======================================
  Coverage   79.69%   79.69%           
=======================================
  Files          11       11           
  Lines         596      596           
=======================================
  Hits          475      475           
  Misses        121      121           

Impacted Files	Coverage Δ
R/DifferentialStatisticsTable.R	85.07% <0.00%> (ø)

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