Ability to change the background and number of avatars

[koddr]

Hi,

Thanks for the opportunity to make your repository README files much more informative.

It would be really great if you could add these improvements here (also, through adding a new element to the link):

1. Changing the background to transparent (for ex., add this to the option theme light|dark|transparent).
2. Changing count of the users to show.
3. Hide the ending circle with dots.

Unfortunately, I don't have the PHP skills to send PR… so the only hope is on you 😉