Update README.md

[ROCm/roctracer commit: eed50bea56]
2019-04-25 14:17:36 -05:00
@@ -26,6 +26,8 @@ asyncronous activity records pool support.

 ## To build and run test
 ```
+ - ROCm-2.3 or higher is required
+
  cd <your path>

 - CLone development branches of roctracer and HIP/HCC: