Make properties, method protected rather than private

[tdtm]

We need to add methods to class \Drip\Client so we were looking at extending it with our custom class, adding the functionality that we need (and use that in our uses rather than the base class).

But many properties and attributes in Drip\Client are private; I don't see why they couldn't be protected instead? That would make it possible for others (like us) to extend it.

[tdtm]

There are no contribution guidelines in the repo, but if you need I can do a PR although for something as simple I'd think it's more efficient if you guys do it 😬

[will-in-wi]

That makes sense to me, feel free to make such a PR! I'm guessing that those of us who write Ruby most of the time forgot that Ruby private is closer to PHP protected.

[will-in-wi]

This just got released in 1.1.0.

[tdtm]

That was efficient! Thanks, much appreciated.