doc: refresh CentOS versions

CentOS 4 doesn't exist any more; use something more modern.

diff --git a/README.rst b/README.rst
index 1e3de8da3b4465ac333932655958ab10b78241bc..6fa672bd75e90503c9dd771422c71c8641ebe912 100644 (file)
--- a/README.rst
+++ b/README.rst
@@ -80,7 +80,7 @@ platform-specific
 -----------------
 Sometimes, the process needs to do something specific depending on the
 distribution, version, release, or architecture. For example installing
-a specific package that is only available on CentOS 5, and not in CentOS 4.
+a specific package that is only available on CentOS 6, and not in CentOS 7.
 
 All steps (setup, build, package, and deploy) can define scripts to be run
 whenever any of the distribution metadata matches.