🐛 Fix: #378 Removing Redundant Condition

[ram-nad]

The code will now throw error if someone tries to index values less than 1.
Also code still works for n == 1 case.

[codecov]

Codecov Report

Merging #379 into master will decrease coverage by 0.07%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master     #379      +/-   ##
==========================================
- Coverage     100%   99.92%   -0.08%     
==========================================
  Files         149      149              
  Lines        2612     2612              
  Branches      434      434              
==========================================
- Hits         2612     2610       -2     
- Misses          0        2       +2

Impacted Files	Coverage Δ
src/algorithms/math/fibonacci/fibonacciNth.js	90% <50%> (-10%)	⬇️
src/algorithms/math/fibonacci/fibonacci.js	91.66% <50%> (-8.34%)	⬇️

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[codecov]

Codecov Report

Merging #379 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #379   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files         149    149           
  Lines        2612   2612           
  Branches      434    434           
=====================================
  Hits         2612   2612

Impacted Files	Coverage Δ
src/algorithms/math/fibonacci/fibonacciNth.js	100% <100%> (ø)	⬆️
src/algorithms/math/fibonacci/fibonacci.js	100% <100%> (ø)	⬆️

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[ram-nad]

Also added the tests