[Issue] The `rl,rls` options are not supported

[Bundy01]

Describe the bug
I noticed that these options weren't working when testing with the sitedossier source, for example. I suspected that it was blocking my VPN's IP.
I thought it was coming from him, but now I suspect the number of requests/min is too high.

On an old branch, I saw a commit including the limits/min c3d8a02.
This is more sensible, for example with the subdomaincenter source and its 2 requests/min.

Subfinder version
Current Version: v2.6.7

Complete command you used to reproduce this
subfinder -s sitedossier -dL FILE -rl NUMBER
subfinder -s sitedossier -rls sitedossier=2/m -dL FILE

Screenshots
an extract from FILE

surreal.vision
askfacebook.net
instagramboomerang.com
instagramboomerang.net
boomerangfrominstagram.com
advertiseonfacebook.net
webinstagramsecurity.com
oculusacademy.net
oculusacademy.org
connect-facebook-mobile.net
connect-facebook-cell.net
friendfeed-inc.com
instagram.bet
instagram.bayern
instagramboomerang.org
instagram.scot
instagram.brussels
instagram-together.org
instagram.shop
instagram.tj
instagram.doctor
instagram.loan

[dogancanbakir]

Hi @Bundy01 ! Thanks for your recent feedbacks—we really appreciate it. As a thank-you, grab some PD stickers here: http://nux.gg/stickers!

Btw, I'll look into this.