Add otter

README.md

@@ -669,6 +669,7 @@ _Data stores with expiring records, in-memory distributed data stores, or in-mem
 - [groupcache](https://github.com/golang/groupcache) - Groupcache is a caching and cache-filling library, intended as a replacement for memcached in many cases.
 - [imcache](https://github.com/erni27/imcache) - A generic in-memory cache Go library. It supports expiration, sliding expiration, max entries limit, eviction callbacks and sharding.
 - [nscache](https://github.com/no-src/nscache) - A Go caching framework that supports multiple data source drivers.
+- [otter](https://github.com/maypok86/otter) - A high performance lockless cache for Go. Many times faster than Ristretto and friends.
 - [remember-go](https://github.com/rocketlaunchr/remember-go) - A universal interface for caching slow database queries (backed by redis, memcached, ristretto, or in-memory).
 - [theine](https://github.com/Yiling-J/theine-go) - High performance, near optimal in-memory cache with proactive TTL expiration and generics.
 - [timedmap](https://github.com/zekroTJA/timedmap) - Map with expiring key-value pairs.