Update version compatibility

Author: vfonic

README.md

@@ -16,8 +16,8 @@ boot it every time you run a test, rake task or migration.
 
 ## Compatibility
 
-* Ruby versions: MRI 2.7, MRI 3.0, MRI 3.1, MRI 3.2
-* Rails versions: 6.0, 6.1, 7.0
+* Ruby versions: MRI 2.7+
+* Rails versions: 6.0+
 * Bundler v2.1+
 
 Spring makes extensive use of `Process.fork`, so won't be able to