Update readme (#45)

* Change heading markup

* Add maven central badge and push event param to CI badge

* Fix links

* Improve text and switch example driver as PhantomJS development has stopped.

* Improve text

README.md

@@ -1,43 +1,50 @@
-Grails Geb Plugin
-=================
+# Grails Geb Plugin
 
-[![Java CI](https://github.com/grails/geb/actions/workflows/gradle.yml/badge.svg)](https://github.com/grails/geb/actions/workflows/gradle.yml)
+[![Maven Central](https://img.shields.io/maven-central/v/org.grails.plugins/geb.svg?label=Maven%20Central)](https://central.sonatype.com/artifact/org.grails.plugins/geb)
+[![Java CI](https://github.com/grails/geb/actions/workflows/gradle.yml/badge.svg?event=push)](https://github.com/grails/geb/actions/workflows/gradle.yml)
 
-Geb Functional Testing for Grails® framework
+Geb Functional Testing for the Grails® framework.
 
+This plugin provides the Geb dependencies and a `create-functional-test` command for generating Geb tests in a Grails app.
 
-This plugin just provides the Geb dependencies and a `create-functional-test` command for generating Geb tests in a Grails app. For further reference please see the [Geb documentation](http://www.gebish.org)
+For further reference please see the [Geb documentation](https://www.gebish.org).
 
-Examples
---------
+## Examples
 
-If you are looking for examples check:
+If you are looking for examples on how to write Geb tests, check:
 
-[Geb/Grails example project](https://github.com/grails-samples/geb-example-grails)
+[Geb/Grails example project](https://github.com/grails-samples/geb-example-grails) or [Grails functional test suite](https://github.com/grails/grails-functional-tests) where Geb tests are used extensively.
 
-or [Grails functional test suite](https://github.com/grails/grails3-functional-tests) where Geb tests are used extensively.
+## Additional Drivers
 
-Additional Drivers
-==================
+Grails comes with a set of pre-installed browser drivers.
+To set up additional drivers you need to add the driver to your `build.gradle` for example:
+```groovy
+integrationTestRuntimeOnly "org.seleniumhq.selenium:selenium-edge-driver:$seleniumVersion"
+```
 
-To setup additional drivers you need to add the driver to your `build.gradle` for example:
+You also need to add it to the `GebConfig.groovy` file in the `src/test/resources/` directory. For example:
+```groovy
+/*
+    This is the Geb configuration file.
 
-    testRuntime 'com.github.detro:phantomjsdriver:1.2.0'
-
-Then you need to create a `GebConfig.groovy` file to your `src/test/resources/` directory. For example:
+    See: http://www.gebish.org/manual/current/#configuration
+*/
 
-	/*
-		This is the Geb configuration file.
-
-		See: http://www.gebish.org/manual/current/#configuration
-	*/
-	import org.openqa.selenium.chrome.ChromeDriver
-	import org.openqa.selenium.firefox.FirefoxDriver
-	import org.openqa.selenium.phantomjs.PhantomJSDriver
-
-	waiting {
-	timeout = 2
-	}
-	driver = { new PhantomJSDriver() }
+/* ... */
+import org.openqa.selenium.edge.EdgeDriver
 
+environments {
+    
+    /* ... */
+    
+    edge {
+        driver = { new EdgeDriver() }
+    }
+}
+```
 
+Now you can run your tests with the new driver by specifying the Geb environment:
+```console
+./gradlew integrationTest -Dgeb.env=edge
+```