README: Update required Java version (#4129)

The badge in the README suggests that ANTLR requires Java 7 or higher, whereas since ANTLR v4.10 Java 11 or higher is required. Signed-off-by: Robert Adam <dev@robert-adam.de>
antlr · Mar 5, 2023 · 8188dc5 · 8188dc5
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diff --git a/README.md b/README.md
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 # ANTLR v4
 
-[![Java 7+](https://img.shields.io/badge/java-7+-4c7e9f.svg)](http://java.oracle.com)
+[![Java 11+](https://img.shields.io/badge/java-11+-4c7e9f.svg)](http://java.oracle.com)
 [![License](https://img.shields.io/badge/license-BSD-blue.svg)](https://raw.github.com/antlr/antlr4/master/LICENSE.txt)