Revert "Add cumulative distribution function"

[pizhn]

Reverts #13

[pizhn]

Well, test failed. Let me look into it

[codecov]

Codecov Report

Merging #14 (0a5e40c) into main (e97c226) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #14   +/-   ##
=======================================
  Coverage   82.17%   82.17%           
=======================================
  Files           3        3           
  Lines         101      101           
=======================================
  Hits           83       83           
  Misses         18       18           

Impacted Files	Coverage Δ
src/kde.jl	78.82% <ø> (ø)

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[davide-f]

@noilreed Judging by the previous loc, it may be just a dependency error: Image in testing should be added probably.

Errors encountered while load File{DataFormat{:PNG}, String}("/tmp/jl_KSc05D/inconversion.png").
All errors:
===========================================

ArgumentError: Package ImageIO [82e4d734-157c-48bb-816b-45c225c6df19] is required but does not seem to be installed:
Fatal error:
 - Run `Pkg.instantiate()` to install all recorded dependencies.

===========================================
ArgumentError: Package ImageMagick [6218d12a-5da1-5696-b52f-db25d2ecc6d1] is required but does not seem to be installed:
 - Run `Pkg.instantiate()` to install all recorded dependencies.