Update README.md (#623)

README.md

@@ -35,7 +35,7 @@ You can learn more on the [Okta + Java][lang-landing] page in our documentation.
 
 This library uses semantic versioning and follows Okta's [library version policy](https://developer.okta.com/code/library-versions/).
 
-:heavy_check_mark: The current stable major version series is: 3.x.x
+:heavy_check_mark: The current stable major version series is: 5.x.x
 
 | Version | Status                    |
 | ------- | ------------------------- |
@@ -44,6 +44,7 @@ This library uses semantic versioning and follows Okta's [library version policy
 | 2.x.x | :clock9: Retiring effective September 03, 2021 |
 | 3.x.x | :clock9: Retiring effective November 10, 2021 |
 | 4.x.x | :heavy_check_mark: Stable ([migration guide](https://github.com/okta/okta-sdk-java/blob/master/MIGRATING.md#migrating-from-3xx-to-400)) |
+| 5.x.x | :heavy_check_mark: Stable ([migration guide](https://github.com/okta/okta-sdk-java/blob/master/MIGRATING.md#migrating-from-4xx-to-500)) |
 
 The latest release can always be found on the [releases page][github-releases].