Returns the current list of download mirrors.
Examples
list_iobr_mirrors()
#> Current IOBR download mirrors:
#> ==============================
#> 1. https://github.com
#> 2. https://gh-proxy.com/https://github.com
#> 3. https://ghproxy.net/https://github.com
#> 4. https://moeyy.cn/gh-proxy/https://github.com
#> 5. https://github.akams.cn/https://github.com
#> 6. http://toolwa.com/github/https://github.com
#> 7. https://v6.gh-proxy.org/https://github.com
#> 8. https://gh-proxy.org/https://github.com
#> 9. https://ghfast.top/https://github.com
#> 10. https://download.githubcdn.com?url=https://github.com
#> 11. https://proxy.gitwarp.top/https://github.com
#> 12. http://biotree.top:49004/d/IOBR_data
#> ==============================
#> Total: 12 mirrors