Tribonacci Sequence

[edumoreira1506]

Hello guys! I saw the project and I like so much of maths algorithms. I saw the fibonacci sequence, that is perfect, but I remember of other sequence, the tribonacci sequence, so what I did was implent this and the respectives tests.

Basically is like fibonacci, but sum the three last elements from sequence. References:

https://brilliant.org/wiki/tribonacci-sequence/
http://mathworld.wolfram.com/TribonacciNumber.html
https://math.stackexchange.com/questions/2280243/tribonacci-sequence-term

[codecov]

Codecov Report

Merging #382 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #382   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files         149    151    +2     
  Lines        2612   2626   +14     
  Branches      434    435    +1     
=====================================
+ Hits         2612   2626   +14

Impacted Files	Coverage Δ
src/algorithms/math/tribonacci/tribonacciNth.js	100% <100%> (ø)
src/algorithms/math/tribonacci/tribonacci.js	100% <100%> (ø)

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