docs: updates readme

README.md

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 # Javafx template
 
-A repository with three variants of a javafx projects, with maven setup for Java 16 and JavaFX 16, and JUnit 5 (Jupiter) and TestFX for testing.
+A repository with three variants of a javafx projects, with maven setup for Java 17 and JavaFX 17, and JUnit 5 (Jupiter) and TestFX for testing.
 
 To make the project(s) more interesting, it is the start of an [RPN](https://en.wikipedia.org/wiki/Reverse_Polish_notation) calculator (look for `// TODO`) markers). The core logic is almost implemented (in [Calc.java](javafx-template/src/main/java/app/Calc.java)), the fxml file (in [App.fxml](javafx-template/src/main/resources/app/App.fxml) is almost complete, but the controller class (in [AppController.java](javafx-template/src/main/java/app/AppController.java) is pretty limited. And last, but not least, there is a TestFX-based test (in [AppTest.java](javafx-template/src/test/java/app/AppTest.java), see the [README](javafx-template/src/test/java/app/README.md) for details about what it tests).