Add invoice line items support

[jayjun]

In other words, implement lines for Invoice objects.

[coveralls]

Coverage remained the same at 19.635% when pulling 81ea988 on jayjun:2.0-line-item into 981ff45 on code-corps:2.0.

[begedin]

Good to go. Love your work @jayjun

Sorry if you felt underappreciated, but it couldn't be further from the truth.

[jayjun]

@begedin No worries mate, glad you’re back. I was more worried about the package getting abandoned, which would put my project in jeopardy.

[joshsmith]

@jayjun definitely understand that fear, but to assuage you, there's absolutely no likelihood of that happening! We process subscriptions with this ourselves right now.

We just need your patience here and there.

The biggest frustration is currently with the testing state of the project. Merging with confidence means pretty extensive reviewing by hand, especially since we're not personally consuming some of the endpoints or use cases being added.

[jayjun]

@joshsmith @begedin I understand your frustration and am following stripity_stripe_testing. Don’t get me wrong, I personally appreciate your efforts so far.

For my company to trust it in production however would require active development, including supporting 1.x until 2.0 is ready. High-level 2.0 discussions look promising, but they fall silent for months. Stripe’s API is a moving target, with 5 version bumps this year so far.

I try to contribute where I can but that seems to compound the problem. Those pull requests are things we (and others) desperately need in production. We simply rather use another actively maintained library than maintain a fork of an inactive one.

So it’s not a matter of patience, but practicality.