[rocksdb] change README to build just rocksdb binding
change mvn build target to just build rocksdb-binding. This also makes the build command to be consistent with these for other bindings.
@@ -26,7 +26,7 @@ Clone the YCSB git repository and compile:
git clone https://github.com/brianfrankcooper/YCSB.git
cd YCSB
- mvn clean package
+ mvn -pl site.ycsb:rocksdb-binding -am clean package
### 2. Run YCSB
