Fixes Min Step Size Bug

[jrenaud90]

Resolves issue #20 by using nextafter instead of double precision EPS to set minimum step size for both the cyrk_ode and nbrk_ode functions.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (0.5.0@b5b8b88). Click here to learn what that means.
Patch coverage: 0.00% of modified lines in pull request are covered.

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Additional details and impacted files

@@           Coverage Diff           @@
##             0.5.0     #23   +/-   ##
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  Coverage         ?   0.00%           
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  Files            ?       6           
  Lines            ?     551           
  Branches         ?       0           
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  Hits             ?       0           
  Misses           ?     551           
  Partials         ?       0           

Flag	Coverage Δ
unittests	0.00% <0.00%> (?)

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Impacted Files	Coverage Δ
CyRK/nb/nbrk.py	0.00% <0.00%> (ø)

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