Add support for computing tribonacci numbers

[ShraddheyaS]

Resolves #322 .

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Description

What is the purpose of this pull request?

This pull request:

• Adds support for computing tribonacci numbers

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves RFC: add support for computing tribonacci numbers #322

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

Yes, using Printf was ot working for me for some reason, changed it to Compat.Printf as per this thread.

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@stdlib-js/reviewers

[kgryte]

@ShraddheyaS What version of Julia are you using?

[kgryte]

@Planeshifter We have yet to update the REQUIRE files, correct? Looks like we still have Julia 0.5 in the REQUIRE file, hence the issue with Printf.

[kgryte]

@ShraddheyaS LGTM! I'll make some minor changes on my end, but this looks good to go! Thanks for working on this!

[Planeshifter]

@Planeshifter We have yet to update the REQUIRE files, correct? Looks like we still have Julia 0.5 in the REQUIRE file, hence the issue with Printf.

Yes, that is correct. Will do shortly.

[kgryte]

@Planeshifter Great! Thanks!