Support new deployment statuses

[3clypse]

👋 First of all, thanks for the project.

Issue

I saw that the gem doesn't support the deployment statuses: in_progress or queued.

The reason is because instead of sending 'application/vnd.github.cannonball-preview+json', they require application/vnd.github.flash-preview+json in the Accept header for these statuses while are in beta.

Tests

I checked that using application/vnd.github.flash-preview+json in all deployments requests made (list N deployments, get a status from a deployment, ...) worked like a charm. I assume that's the only change it needs.

Docs

• https://docs.github.com/en/free-pro-team@latest/rest/reference/repos#list-deployment-statuses-preview-notices
• https://developer.github.com/changes/2018-10-16-deployments-environments-states-and-auto-inactive-updates/#new-deployment-status-states
• https://developer.github.com/changes/2014-11-25-the-deployments-api-is-official/

[piotrmurach]

Hi David,

Thanks for submitting the issue report.

You can either provide accept header value with your request or submit PR to get this changed.