ENH Implemented dl(f, n).

[abalkin]

Closes #6.

[codecov]

Codecov Report

Merging #41 into master will decrease coverage by 0.04%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
- Coverage   61.92%   61.87%   -0.05%     
==========================================
  Files          11       11              
  Lines         541      543       +2     
==========================================
+ Hits          335      336       +1     
- Misses        206      207       +1

Impacted Files	Coverage Δ
src/_k.jl	68.84% <33.33%> (-0.2%)	⬇️

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[coveralls]

Coverage increased (+0.03%) to 87.532% when pulling f180ef9 on dl into 8b8546e on master.

[coveralls]

Coverage increased (+0.03%) to 87.532% when pulling f180ef9 on dl into 8b8546e on master.