Link update

README.md

@@ -389,7 +389,7 @@
   * [FlockDB](https://github.com/twitter/flockdb) - Twitter's distributed, fault-tolerant graph database.
   * [Neo4j](http://www.neo4j.org/) - Open source graph database.
 * Key-Value
-  * [LevelDB](https://code.google.com/p/leveldb/) - Google's high performance key/value database.
+  * [LevelDB](https://github.com/google/leveldb) - Google's high performance key/value database.
   * [Redis](http://redis.io/) - Networked, in-memory, key-value data store with optional durability.
   * [Riak](http://basho.com/riak/) - Another fault-tolerant key-value NoSQL database.