More hyperlinks to benchmarked libraries in README.md please

[katusk]

Hi @dkormalev, I've just seen your great talk, and I'm having trouble identifying which "threadpoolcpp" library you mention -- a google search yields more viable repositories than I'd expect. Could you please update all the occurrences of "threadpoolcpp" in your README.md with a proper link to its original source repository? The other libs are well-known enough so that I know exactly which ones you talk about (e.g. in case of boost, TBB, Qt, or folly). Thanks.

[dkormalev]

This threadpoolcpp was meant in the text. Sorry for being misleading :) https://github.com/inkooboo/thread-pool-cpp. I'll update README.md later.

[katusk]

No worries, thanks a lot! :)