Update now Jakarta EE 9 has been released

README.md

@@ -53,12 +53,10 @@ The migration tool is available as an Ant task, here is an example:
 
 ## Differences between Java EE 8 and Jakarta EE 9
 
-Jakarta EE 9 is still under development and there are some details that remain
-to be worked out.
-
-The differences currently supported by this tool are:
-
-* Renaming packages for Jakarta EE 9 APIs from `javax.*` to `jakarta.*`
+The differences between Java EE 8 and Jakarta EE 9 are limited to packages
+moving from the `javax.*` namespace to the `jakarta.*` namespace. Some packages
+have also been renamed. This migration tool performs all the package renaming
+necessary to migrate an application from Java EE 8 to Jakarta EE 9.
 
 Note: It will not be necessary to migrate any references to XML schemas. The
 schemas don't directly reference javax packages and Jakarta EE 9 will continue