update play readme with perf data for both server backends
update play readme with perf data for both server backends

gengstrand/clojure-news-feed,gengstrand/clojure-news-feed,gengstrand/clojure-news-feed,gengstrand/clojure-news-feed,gengstrand/clojure-news-feed,gengstrand/clojure-news-feed,gengstrand/clojure-news-feed,gengstrand/clojure-news-feed,gengstrand/clojure-news-feed