Update README.md

Author: Olexandr88

README.md

@@ -1,12 +1,12 @@
 # Design Patterns Implemented in Java
 
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+[![Java CI](https://github.com/iluwatar/java-design-patterns/workflows/Java%20CI/badge.svg)](https://github.com/iluwatar/java-design-patterns/actions/workflows/maven-ci.yml)
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