update packages

[shreyas-badiger]

updating the following packages to v0.20.15

       k8s.io/api v0.20.15
       k8s.io/apimachinery v0.20.15
       k8s.io/client-go v0.20.15

Fixes #97

[codecov]

Codecov Report

Merging #105 (036f1c9) into master (0e51f77) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #105   +/-   ##
=======================================
  Coverage   59.76%   59.76%           
=======================================
  Files          11       11           
  Lines        1541     1541           
=======================================
  Hits          921      921           
  Misses        524      524           
  Partials       96       96           

Files Changed	Coverage Δ
pkg/reaper/nodereaper/helpers.go	76.52% <100.00%> (ø)
pkg/reaper/nodereaper/nodereaper.go	46.72% <100.00%> (ø)
pkg/reaper/pdbreaper/pdbreaper.go	70.35% <100.00%> (ø)
pkg/reaper/podreaper/podreaper.go	73.30% <100.00%> (ø)

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