v3.2.1 Add renaming folders and files if they are using a title that isn't the main title

[ArdaxHz]

Added:

• Rename old series folders if they're using a different title to that of MangaDex.
• rename argument to skip renaming folders.

Modified:

• Fix cover download.
• Whitelist users for downloads with group whitelist.
• Use loop.create_task() instead of asyncio.ensure_future().
• Update readme.