Revenj faster than Jil

[paya-cz]

There seems to be a new competition to Jil performance-wise, called Revenj: https://github.com/ngs-doo/json-benchmark/

There are some issues with the benchmarks they have, but after fixing the problems Revenj does perform consistently better on the 2 out of 3 datasets in the benchmark. In the first dataset, it performs better by a huge margin (takes only 40% time of what Jil takes).