Update README.md (#3031)

Author: pivovarit

README.md

@@ -12,7 +12,7 @@
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-Vavr is an **object-functional extension for Java that reduces boilerplate code and enhances code quality.**
+Vavr is an **object-functional extension for Java that makes defensive programming easy by leveraging immutability and functional control structures**
 
 Vavr seamlessly combines object-oriented programming with the elegance and robustness of functional programming.