Add request_cache_plug to Caching section

README.md

@@ -389,6 +389,7 @@ There are [other sites with curated lists of elixir packages](#other-awesome-lis
 * [lru_cache](https://github.com/arago/lru_cache) - Simple LRU Cache, implemented with ets.
 * [memoize](https://github.com/melpon/memoize) - A memoization macro that easily cache function.
 * [nebulex](https://github.com/cabol/nebulex) - A fast, flexible and extensible distributed and local caching library for Elixir.
+* [request_cache_plug](https://github.com/MikaAK/request_cache_plug) - Easy to use caching for requests in either Phoenix Controllers or GraphQL resolvers. Bypasses JSON encoding/decoding for a large speedup.
 * [stash](https://github.com/whitfin/stash) - A straightforward, fast, and user-friendly key/value store.
 
 ## Chatting