We should note somewhere that converting to JSON results in the database makes everything faster

I made [some benchmarks](https://mitar.tnode.com/post/181893159351/in-nodejs-always-query-in-json-from-postgresql). It seems that converting results to JSON on the server will make reading always faster. It seems that parsing using JavaScript's JSON parser is much faster than parsing PostgreSQL fields.

Also, JS version is faster than native in all tests I made.