Add Koa, others to benchmarks

[shellscape]

I'd like to see Koa and others added to benchmarks. I think it'd be an interesting comparison.

[RomainLanz]

Hey @shellscape! 👋🏻

There's no need to add all the Node.js frameworks in our benchmark test suite.
If you are interested in those "dumb" benchmark, feel free to checkout Web Frameworks Benchmark

[shellscape]

did not know that existed! would be a handy link from your benchmarks readme.

[thetutlage]

Hello world benchmarks are not something we celebrate or push. Simply because they are far from the reality or how actual apps are written.

[McSneaky]

Techempower benchmarks are slightly more useful, since they also have DB calls, inserts, template renders etc in there. Slighty more "real world" than "Hello World", but still real far from actual applications