Benchmark results need updating

[Gobd]

See auth0/node-jsonwebtoken#966 and update the benchmarks with the best practices suggested to make benchmark results reflect current versions.

[ilteoood]

As you can see by simply blaming the README.md file, the benchmarks have been executed more than 5 years ago, which is far before the creation of that issue and the introduction of that regression.

Can the benchmark be improved? Of course!
Have we been unfair? Absolutely no.

[Gobd]

Sorry I didn't mean to imply any wrongdoing or anything, I didn't notice the benchmarks were that old! I just like accurate benchmarks so I can make good decisions about what packages to use :)