[release] update README for 0.17.0 release. (brianfrankcooper#1363)

closes brianfrankcooper#1362

Author: busbey

README.md

@@ -34,9 +34,9 @@ Getting Started
 1. Download the [latest release of YCSB](https://github.com/brianfrankcooper/YCSB/releases/latest):
 
     ```sh
-    curl -O --location https://github.com/brianfrankcooper/YCSB/releases/download/0.15.0/ycsb-0.15.0.tar.gz
-    tar xfvz ycsb-0.15.0.tar.gz
-    cd ycsb-0.15.0
+    curl -O --location https://github.com/brianfrankcooper/YCSB/releases/download/0.17.0/ycsb-0.17.0.tar.gz
+    tar xfvz ycsb-0.17.0.tar.gz
+    cd ycsb-0.17.0
     ```
 
 2. Set up a database to benchmark. There is a README file under each binding