Update README.md

Author: bonclay7

README.md

@@ -21,7 +21,7 @@ To explore the complete project documentation, please visit our [documentation s
 
 ## ⚠️  Dropping base module
 
-Starting in v2.11.0, we have removed the [base module](https://github.com/aws-observability/terraform-aws-observability-accelerator/blob/v2.10.3/docs/concepts.md#base-module)
+Starting in v2.12.0, we have removed the [base module](https://github.com/aws-observability/terraform-aws-observability-accelerator/blob/v2.10.3/docs/concepts.md#base-module)
 which previously served as a glue between modules. However, the modules were quite
 independent and the base module provided limited functionality.