Added Concurrency

Added concurrency option using p-limit. Allowing the user to specify how many concurrent compressed XML sitemaps they want to process at once. This was previously a sequential process.

Still compatible with old implementation, concurrency defaults to 1 if not specified in the function call.

1.0.2

Added logs for progress / activity indication. Logs which sitemaps are being processed.

Stable Release

First stable release. Documentation added.

Release Candidate 1

First release candidate for testing purposes.