Adding BuntDB

README.md

@@ -227,6 +227,7 @@ Please take a quick gander at the [contribution guidelines](https://github.com/a
 *Databases implemented in Go.*
 
 * [bolt](https://github.com/boltdb/bolt) - A low-level key/value database for Go.
+* [buntdb](https://github.com/tidwall/buntdb) - A fast, embeddable, in-memory key/value database for Go with custom indexing and spatial support.
 * [cache2go](https://github.com/muesli/cache2go) - An in-memory key:value cache which supports automatic invalidation based on timeouts.
 * [cockroach](https://github.com/cockroachdb/cockroach) - A Scalable, Geo-Replicated, Transactional Datastore
 * [couchcache](https://github.com/codingsince1985/couchcache) - A RESTful caching micro-service backed by Couchbase server.