Add RSP1B to Readme

Author: SDRplay

README.md

@@ -4,10 +4,14 @@ This is a repository of the ExtIO plugins for the SDRplay RSPs
 
 All of these plugins require the API 3.07 or above.
 
+Note: The RSP1B ExtIO plugin requires API 3.14 MINIMUM
+
 Note: The RSPdx ExtIO plugin DOES NOT, AND WILL NOT, SUPPORT HDR MODE. Not possible to do with just the ExtIO protocol.
 
 This source code is all provide as is without support.
 
-The Releases section will contain a installer package which includes API 3.11
+The Releases section will contain a zip file of just the ExtIO plugins.
+
+Go to https://www.sdrplay.com/downloads to get the relevant API
 
 SDRplay