🚀[Feature]: Create organization invitations, list organization members

[ThePoShWolf]

Description

I would love to use this module to invite users to GitHub organizations and be able to list members to check before sending.

Here's how you can list members:

Invoke-GitHubAPI -Method Get -ApiEndpoint /orgs/<org>/members

And how to send an invite:

$splat = @{
    Method = 'Post'
    ApiEndpoint = '/orgs/<org>/invitations'
    Body = @{
        invitee_id = 'githubusername'
        role = 'direct_member'
    } | ConvertTo-Json -Compress
    ContentType = 'application/json'
}
Invoke-GitHubAPI @splat

I intend to fork, make the changes, and submit a PR for your review.

[MariusStorhaug]

Version 0.9.5 should now support the request.
Send invite: New-GitHubOrganizationInvitation
List members: Get-GitHubOrganizationMember