Change JDK 8 in README

Author: bonigarcia

README.md

@@ -2,7 +2,7 @@
 [![Build Status](https://github.com/bonigarcia/webdrivermanager/workflows/build/badge.svg)](https://github.com/bonigarcia/webdrivermanager/actions)
 [![Quality Gate](https://sonarcloud.io/api/project_badges/measure?project=io.github.bonigarcia:webdrivermanager&metric=alert_status)](https://sonarcloud.io/dashboard/index/io.github.bonigarcia:webdrivermanager)
 [![codecov](https://codecov.io/gh/bonigarcia/webdrivermanager/branch/master/graph/badge.svg)](https://codecov.io/gh/bonigarcia/webdrivermanager)
-[![badge-jdk](https://img.shields.io/badge/jdk-11-green.svg)](https://www.oracle.com/java/technologies/javase-downloads.html)
+[![badge-jdk](https://img.shields.io/badge/jdk-8-green.svg)](https://www.oracle.com/java/technologies/javase-downloads.html)
 [![License badge](https://img.shields.io/badge/license-Apache2-green.svg)](https://www.apache.org/licenses/LICENSE-2.0)
 [![Backers on Open Collective](https://opencollective.com/webdrivermanager/backers/badge.svg)](#backers)
 [![Sponsors on Open Collective](https://opencollective.com/webdrivermanager/sponsors/badge.svg)](#sponsors)