Adds medianflow tracker

[arijitkar98]

[codecov[bot]]

Codecov Report

Merging #6 into master will increase coverage by 0.11%. The diff coverage is 93.68%.

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
+ Coverage   93.21%   93.33%   +0.11%     
==========================================
  Files           5        8       +3     
  Lines         280      375      +95     
==========================================
+ Hits          261      350      +89     
- Misses         19       25       +6

Impacted Files	Coverage Δ
src/tracker_model.jl	100% <100%> (ø)
src/tracker.jl	100% <100%> (ø)
src/medianflow_tracker/medianflow_tracker.jl	93.02% <93.02%> (ø)

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