Add Hash-splat operator to GithubHelper methods

[raafaelima]

What does this solve?

As discussed here at PR #420. This PR aims to add the hash conversion operator (aka **) to the methods on GithubHelper that use the named param options: in their signature. With this, we hope to improve the legibility and make those methods calls cleaner.

Good, but what is this Hash Operator?

This operator will allow the call site of those methods to just provide the options: variable/parameter directly as if they were keywords (kinda "flattening the Hash into keyword parameters") without having to wrap those options into { … } curly braces to make them a Hash. So the call site would look like this:

Instead of

github_helper.update_milestone(repository: repository, number: milestone[:number], options: { title: mile_title })

We'd have:

# Inside `update_milestone`'s implementation, the variable/parameter `options` would be a Hash equal to `{ title: mile_title }`
github_helper.update_milestone(repository: repository, number: milestone[:number], title: mile_title)

[AliSoftware]

Nice 👍