Remove note about 1.x releases (open-telemetry#13849)

Author: jaydeluca

README.md

@@ -39,13 +39,6 @@ This package includes the instrumentation agent as well as
 instrumentations for all supported libraries and all available data exporters.
 The package provides a completely automatic, out-of-the-box experience.
 
-*Note: There are 2.x releases and 1.x releases. The 2.0 release included significant breaking
-changes, the details of which can be found in the [release notes](https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases/tag/v2.0.0).
-It is recommended to use the latest 2.x release which will have the latest features and improvements.
-1.x will receive security patches for a limited time and will not include other bug fixes and
-enhancements.*
-
-
 Enable the instrumentation agent using the `-javaagent` flag to the JVM.
 
 ```