Update README.html.

Author: sletz

Build/README.html

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 ###Change log
 
+----------------------------------------------------
+05/01/20234: version 2.5.17
+
+- integrates Faust compiler version 2.70.3
+- based on LLVM 15.0.7 on Windows and 16.0.6 on macOS 
+- latest version of the Faust libraries
+
+----------------------------------------------------
+10/07/2023: version 2.5.16
+
+- integrates Faust compiler version 2.61.1
+- based on LLVM 15.0.7 on Windows and 16.0.6 on macOS 
+- latest version of the Faust libraries
+
 ----------------------------------------------------
 05/09/2023: version 2.5.15