Update README.md

Author: bsmith96

README.md

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 [![ko-fi](https://ko-fi.com/img/githubbutton_sm.svg)](https://ko-fi.com/F1F120U9I)
 
+> **NB**: If you are looking for the standalone Node.js version, check release v3.1.0 and earlier.
+
 # Custom Module for Open Stage Control
 
 This version runs entirely within the [Open Stage Control](http://openstagecontrol.ammd.net/) software, as a 'custom module'. It requests updates from Qlab when there are changes to the workspace, and interprets the responses appropriately - the module ignores responses which do not relate to the playhead position of the chosen cue list.
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 ## Module disconnected from Qlab
 ![Open Stage Control Module](_images/C_Open_Stage_Control_Disconnected.png)
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