Add subscription `status` type `incomplete`

[keyding]

Issue #83.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: aeba8f5b69b8cdf042d0a723ff57625aac748003

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ----------------------------- | ----- | | @lemonsqueezy/lemonsqueezy.js | Patch |

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[brankoconjic]

@keyding, this does not align with the Lemon Squeezy API docs. I will need to check that on our side.

[brankoconjic]

The incomplete is a valid status, which happens before a subscription has been fulfilled.