Update README of test directory.

[ci skip]

tests/README.md

@@ -47,7 +47,7 @@ Integration tests for commands that are not defined in the specified server prof
 of the `REDIS_SERVER_VERSION` constant in `phpunit.xml`) are marked as __skipped__ automatically.
 
 By default, the test suite is configured to execute integration tests using the server profile for
-Redis v2.8. You can run the suite against a Redis instance built from the `unstable` branch with the
+Redis 3.2. You can run the suite against a Redis instance built from the `unstable` branch with the
 development profile by changing the `REDIS_SERVER_VERSION` to `dev` in the `phpunit.xml` file.
 
 If you do not have a Redis instance up and running or available for testing, you can completely