Update README.adoc

Default Java version is 17

Signed-off-by: Thomas Segismont <[email protected]>

Author: tsegismont

README.adoc

@@ -36,7 +36,7 @@ You can provide the following query parameters to customize the project:
 * `vertxVersion`: the Vert.x version
 * `vertxDependencies`: a comma separated list of artifactIds of the vert.x modules
 * `packageName`: code package name, derived from `groupId` and `artifactId` by default
-* `jdkVersion`: which version of the JDK to use, defaults to `11`
+* `jdkVersion`: which version of the JDK to use, defaults to `17`
 
 Full example: