Updating for ActiveRecord 7.0 support

Author: mstroming

README.md

@@ -494,7 +494,7 @@ in `authlogic/session/base.rb`.
 
 | Version | branch       | ruby     | activerecord  |
 | ------- | ------------ | -------- | ------------- |
-| 6.4     | 6-4-stable   | >= 2.4.0 | >= 5.2, < 6.2 |
+| 6.4.2   | 6-4-stable   | >= 2.4.0 | >= 5.2, < 7.1 |
 | 5.2     | 5-2-stable   | >= 2.3.0 | >= 5.2, < 6.1 |
 | 4.5     | 4-5-stable   | >= 2.3.0 | >= 4.2, < 5.3 |
 | 4.3     | 4-3-stable   | >= 2.3.0 | >= 4.2, < 5.3 |