Fix issue with sampling without replacement

[aristizabal95]

Before this fix uniform sampling is not guaranteed, over-representing the first combination of neighbors, and not sampling the last possible combination.

This PR ensures all neighbor combinations are considered during sampling, by extending the range of possible indices to include the last element.

Referencing to the example showcased in #385, using this change the sampling distribution is now:

(0, 1) 0.1707
(0, 2) 0.1643
(0, 3) 0.165
(1, 2) 0.1639
(1, 3) 0.1693
(2, 3) 0.1668

Closes #385.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.09%. Comparing base (2d55981) to head (9d916ed).
Report is 4 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #386   +/-   ##
=======================================
  Coverage   73.09%   73.09%           
=======================================
  Files          29       29           
  Lines        1171     1171           
=======================================
  Hits          856      856           
  Misses        315      315           

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