fixed README

Author: samitani

README.md

@@ -28,12 +28,12 @@ mysql> CREATE DATABASE sbtest;
 ```
 2. Execute prepare command to create tables and records.
 ```
-go-sysbench --tables=1 --mysql-port=3570 --mysql-user=app --mysql-password=Password --time=360 --threads=5 --table_size=10000 --report-interval=1 --histogram=on oltp_read_write prepare
+go-sysbench --tables=1 --mysql-user=appuser --mysql-password=Password --time=360 --threads=5 --table_size=10000 --report-interval=1 --histogram=on oltp_read_write prepare
 ```
 3. Run benchmark
 In this example, It will run the benchmark for 360 seconds with 5 threads.
 ```
-go-sysbench --tables=1 --mysql-port=3570 --mysql-user=app --mysql-password=Password --time=360 --threads=5 --table_size=10000 --report-interval=1 --histogram=on oltp_read_write run
+go-sysbench --tables=1 --mysql-user=appuser --mysql-password=Password --time=360 --threads=5 --table_size=10000 --report-interval=1 --histogram=on oltp_read_write run
 ```
 
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