Remove github.com/pkg/errors

[lucasmdrs]

This PR replace the use of github.com/pkg/errors package with the native approach

[codecov-commenter]

Codecov Report

Merging #133 (27d8518) into master (e246e46) will not change coverage.
The diff coverage is 10.00%.

@@           Coverage Diff           @@
##           master     #133   +/-   ##
=======================================
  Coverage   46.96%   46.96%           
=======================================
  Files           8        8           
  Lines         313      313           
=======================================
  Hits          147      147           
  Misses        159      159           
  Partials        7        7           

Impacted Files	Coverage Δ
pkg/anonymiser/anonymiser.go	81.42% <0.00%> (ø)
pkg/dumper/query/dumper.go	0.00% <0.00%> (ø)
pkg/config/config.go	85.18% <33.33%> (ø)

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