Add weighted permutation entropy.

[julesjulian]

[codecov[bot]]

Codecov Report

Merging #14 into master will decrease coverage by 13.08%. The diff coverage is 7.69%.

@@             Coverage Diff             @@
##           master      #14       +/-   ##
===========================================
- Coverage   92.25%   79.16%   -13.09%     
===========================================
  Files           2        2               
  Lines         142      168       +26     
===========================================
+ Hits          131      133        +2     
- Misses         11       35       +24

Impacted Files	Coverage Δ
pyentrp/entropy.py	73.48% <7.69%> (-16.14%)	:arrow_down:

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