[Enhencement] Support more style of the badge

[1chooo]

First of all, thank you for creating this project, which allows me to see the number of people visiting my GitHub Profile. However, I would like to request the addition of four additional badge styles: flat, flat-square, plastic, and for-the-badge. This would allow users to choose their preferred badge style. Currently, I haven't found this feature, and I've also tried appending &style=for-the-badge to the URL, but it didn't work. Therefore, I'm opening this issue to request the addition of these styles. If you need any assistance from me, please feel free to let me know, and I'll do my best to help.

Feel free to use this text as the issue description when creating your request.

@1chooo