fix: hadnle zeros at the endpoints in BisectionMethod

[vil02]

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Describe your change:

findRoot errors when one is trying to find a root for x^3 on the interval [-1, 1]. This PR fixes that and adds a test cave case covering:

JavaScript/Maths/BisectionMethod.js

Line 29 in 4a4ed57

throwError(

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Documentation change?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new JavaScript files are placed inside an existing directory.
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• All new algorithms have a URL in their comments that points to Wikipedia or another similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.09%. Comparing base (bd34e9f) to head (f2f10bd).

Additional details and impacted files

@@ Coverage Diff @@## master #1640 +/- ## ========================================== + Coverage 84.07% 84.09% +0.02%  ========================================== Files 375 375 Lines 19688 19687 -1 Branches 2913 2914 +1 ========================================== + Hits 16552 16556 +4 + Misses 3136 3131 -5 

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[appgurueu]

Math.pow(x, n) can be written as x**n btw, so you could simply write x => x ** 2 for example.