fix(options): fix time spread and flaky strategies

[carlobortolan]

Closes #43.

[codecov]

Codecov Report

Attention: Patch coverage is 91.30435% with 4 lines in your changes missing coverage. Please review.

Project coverage is 91.77%. Comparing base (f8a25e7) to head (a25d5b8).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/options/traits/option_strategy.rs	85.71%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #48      +/-   ##
==========================================
+ Coverage   90.70%   91.77%   +1.06%     
==========================================
  Files          19       19              
  Lines        2120     2140      +20     
==========================================
+ Hits         1923     1964      +41     
+ Misses        197      176      -21     

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