issue #44 add GetVisitDate

[VarshC]

Added the function as well as its tests. Also fixed test for GetVisitConcept()

[codecov[bot]]

Codecov Report

Merging #45 (779d21f) into dev (7c6e333) will increase coverage by 5.25%. The diff coverage is 92.30%.

@@            Coverage Diff             @@
##              dev      #45      +/-   ##
==========================================
+ Coverage   68.10%   73.36%   +5.25%     
==========================================
  Files           5        6       +1     
  Lines         185      199      +14     
==========================================
+ Hits          126      146      +20     
+ Misses         59       53       -6     

Impacted Files	Coverage Δ
src/getters.jl	86.36% <92.30%> (+8.01%)	:arrow_up:
src/OMOPCDMCohortCreator.jl	100.00% <0.00%> (ø)

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