Update README.md

Author: Rajesh-VPai

README.md

@@ -237,6 +237,12 @@ Simple Expression Map2(IntegrExpr):
 
 The Design intent has been to allow extremely small values(Delta x) to be properly algebraicly mapped and Differentiated.It also helps in the debugging of very large Strings Equations  to check which term is causing the error.
 
+#  Release 4.0
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