Update README.md

Author: javadev

README.md

@@ -16,7 +16,7 @@ underscore-java
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+[![Maintainability Rating](https://sonarcloud.io/api/project_badges/measure?project=javadev_underscore-java&metric=sqale_rating)](https://sonarcloud.io/summary/new_code?id=javadev_underscore-java)
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