Upgrade resty dependency

[mauricioabreu]

Update imports
Update logger interface
Fix tests

[KalilCazes]

Awesome work ❤️ .

[lucasrodcosta]

@mauricioabreu why change the logger interface?

It wouldn't be enough to keep the NewHTTPClient receiving an io.Writer instead of a Logger?

[mauricioabreu]

@lucasrodcosta I had to change the interface because resty got upgraded, and the new interface is different from v1

One thing I have noticed is that they created a interface for this. So we can replace our custom interface by resty.Logger. What is your opinion?

[mauricioabreu]

I've changed the custom interface by resty.Logger @lucasrodcosta @KalilCazes

[KalilCazes]

Hey @mauricioabreu .

Could you update the examples section in README? After this PR, a logger struct is needed to initialize NewHTTPClient()

[mauricioabreu]

Good gatch @KalilCazes

Done!