brianfrankcoopergh-66 updated readme

0.1.3 - 10/26/10

- Voldemort binding (rsumbaly)
- HBase client improvements (ryanobjc)
- Fixes to Cassandra 0.7 binding (johanoskarsson, nickmbailey)
- Added an interface for exporting the measurements and a JSON implementation. It can write to both stdout and to a file (johanoskarsson)
- Other minor fixes (brianfrankcooper)

Release 0.1.2

0.1.2 - 5/12/10

- MongoDB binding (ypai)
- Cassandra 0.7 binding (johanoskarsson)
- Simple command line interface (brianfrankcooper)
- Faster string generation (tlipcon)
- Avoid Bytes conversion in HBaseClient (tlipcon)

YCSB 0.1.1

- Compiles under Java 1.5 (brianfrankcooper#5)
- Supports per thread throughput >1000 ops/sec (brianfrankcooper#4)
- Flushes properly to HBase (brianfrankcooper#3)

0.1.0 - First official version of YCSB