Add deque in Go

[leandronsp]

This PR adds an implementation in Go for Deque (double-ended queue).

It covers some test scenarios using the library testify which makes easier to write unit tests in Go.

[kelvins]

Hi @leandronsp, could you please add package main and apply gofmt

[leandronsp]

My bad, I forgot to apply go fmt. Gonna do that and once it passed, I'll do for the other PR's I left open.

[leandronsp]

@kelvins it seems that the testify package is making the lint phase fail. I'll remove the testify and rewrite the tests following other go files in this project, I'll work on that in the next couple of days

[leandronsp]

Otherwise, do you think it's a good idea adding testify assert to the pipeline? I think it helps writing good tests in Go. But I'm okay in case you think we should not use it for now

[kelvins]

I agree that testify is a great library for performing assertions, but since this repository is intended for study purposes, I suggest avoiding any kind of external library. Using external libraries would make it difficult for newcomers to contribute, it would be hard to run the code online (like in playgrounds) and harder to maintain (to keep library versions updated).

I would suggest implementing tests using the standard library or implementing a main function and printing some examples (not ideal but it is easy to check).

[leandronsp]

okay @kelvins , I'll apply the adjustments and update the PR, thanks

[leandronsp]

up @kelvins