Update README.md

README.md

@@ -26,38 +26,6 @@ Go 1.21+
   implementation of [LevelDB](https://github.com/google/leveldb) (see below).
   Currently the default on-disk database used in the Cosmos SDK.
 
-- **MemDB [stable]:** An in-memory database using [Google's B-tree
-  package](https://github.com/google/btree). Has very high performance both for
-  reads, writes, and range scans, but is not durable and will lose all data on
-  process exit. Does not support transactions. Suitable for e.g. caches, working
-  sets, and tests. Used for [IAVL](https://github.com/tendermint/iavl) working
-  sets when the pruning strategy allows it.
-
-- **[LevelDB](https://github.com/google/leveldb) [experimental]:** A [Go
-  wrapper](https://github.com/jmhodges/levigo) around
-  [LevelDB](https://github.com/google/leveldb). Uses LSM-trees for on-disk
-  storage, which have good performance for write-heavy workloads, particularly
-  on spinning disks, but requires periodic compaction to maintain decent read
-  performance and reclaim disk space. Does not support transactions.
-
-- **[BoltDB](https://github.com/etcd-io/bbolt) [experimental]:** A
-  [fork](https://github.com/etcd-io/bbolt) of
-  [BoltDB](https://github.com/boltdb/bolt). Uses B+trees for on-disk storage,
-  which have good performance for read-heavy workloads and range scans. Supports
-  serializable ACID transactions.
-
-- **[RocksDB](https://github.com/linxGnu/grocksdb) [experimental]:** A [Go
-  wrapper](https://github.com/linxGnu/grocksdb) around
-  [RocksDB](https://rocksdb.org). Similarly to LevelDB (above) it uses LSM-trees
-  for on-disk storage, but is optimized for fast storage media such as SSDs and
-  memory. Supports atomic transactions, but not full ACID transactions.
-
-- **[BadgerDB](https://github.com/dgraph-io/badger) [experimental]:** A
-  key-value database written as a pure-Go alternative to e.g. LevelDB and
-  RocksDB, with LSM-tree storage. Makes use of multiple goroutines for
-  performance, and includes advanced features such as serializable ACID
-  transactions, write batches, compression, and more.
-
 - **[PebbleDB](https://github.com/cockroachdb/pebble) [experimental]:** Pebble
   is a LevelDB/RocksDB inspired key-value store focused on performance and
   internal usage by CockroachDB. Pebble inherits the RocksDB file formats and a