Change comparison operator to avoid problematic p=0 edge case

[getzdan]

Since rand() has been (at this point) agreed to return a value in [0,1) , there is the remote possibility of returning true when sampling a Bernoulli(0.0) distribution if we use <=. Changing this to < removes this possibility.

On the other side of [0,1) , Bernoulli(1.0) still always returns true as expected.

An argument against accepting this PR might be the change in probability of returning true on all intermediate values. As the sampling is not mathematically perfect but limited to computer representation, the current rand() might be closer to mathematical Bernoulli(p) with <=.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.19%. Comparing base (07d1e78) to head (6ae92fa).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1799   +/-   ##
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  Coverage   86.19%   86.19%           
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  Files         146      146           
  Lines        8767     8768    +1     
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+ Hits         7557     7558    +1     
  Misses       1210     1210           

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