README: update wrt added support for RocksDB and recent ZODB

README.rst

@@ -16,7 +16,7 @@ A NEO cluster is composed of the following types of nodes:
 
   Stores data, preserving history. All available storage nodes are in use
   simultaneously. This offers redundancy and data distribution.
-  Available backends: MySQL (InnoDB or TokuDB), SQLite
+  Available backends: MySQL (InnoDB, RocksDB or TokuDB), SQLite
 
 - "admin" nodes (mandatory for startup, optional after)
 
@@ -52,7 +52,7 @@ Requirements
 
   - MySQLdb: https://github.com/PyMySQL/mysqlclient-python
 
-- For client nodes: ZODB 3.10.x
+- For client nodes: ZODB 3.10.x or later
 
 Installation
 ============