Merge pull request #1186 from seuros/ja21

Fix version for java requirement

Author: headius

README.md

@@ -28,7 +28,7 @@ Versions are targeted at certain versions of Rails and live on their own branche
 | 70.x        | 7.0.x         | 70-stable | 9.3.0     | 8        |
 | 71.x        | 7.1.x         | 71-stable | 9.4.3     | 8        |
 | 72.x        | 7.2.x         | 72-stable | 9.4.3     | 8        |
-| 80.x        | 8.0.x         | master    | 10.0.0    | 8        |
+| 80.x        | 8.0.x         | master    | 10.0.0    | 21       |
 
 Note: 80.x is still under development and not supported yet.