Added threading to improve performance and a try/except on request

[LuanFranco98]

First of all i want to congratulate you for your code, this is very helpfull and I've been searching for something like it for quite some time.
I wanted to use it to capture the CS:GO skins market but when i tried to run your code it kept getting request errors after 2 or more hours of the code running so I decided to try to fix it.
I did a workarround with the request part by adding a try/except to avoid stopping the execution of the program and it worked fine but the program would still take at least 12 hours to run so i implemented threading to parallelize the requests and make it more time efficient.
This is by no means perfect but I think it is a welcoming adition to your already amazing code.
Hope you find it usefull.

[blakeporterneuro]

Hey Luan,
This is great! Glad my code was a useful base. Thanks for helping to improve it.
Cheers,
Blake