Minor update to caution message in Readme

Author: coderarjob

README.md

@@ -12,10 +12,11 @@ This is a hardware project based on Atmega8A microcontroller. This project came
 personal need for a demo board to test my new oscilloscope. I plan to create a complete PCB
 along with firmware in this repo.
 
-**Caution**: The master branch contains changes for the upcoming version and may not always be
-stable. Use one of the [released](https://github.com/coderarjob/signal.echo/releases) versions if
-you intend to manufacture. See [LICENCE](./LICENSE) for terms under which this project is released
-and developed.
+**Caution**: The `master` branch contains changes for the upcoming version and may not always be
+stable. If you wish to manufacture, use the latest `release/version_x.x` branch or one of the
+[released](https://github.com/coderarjob/signal.echo/releases) versions.
+
+See [LICENCE](./LICENSE) for terms under which this project is released and developed.
 
 ### Screenshots