Update README.md to advise on plugin ordering in Gradle

jsonschema2pojo-gradle-plugin/README.md

@@ -8,6 +8,8 @@ This Gradle plugin is hosted on both Maven Central and the [Gradle Plugin Portal
 
 ## Usage
 
+For Gradle 7.3 and later, you can use the plugins DSL:
+
 With Groovy:
 
 ```groovy
@@ -34,6 +36,9 @@ jsonSchema2Pojo {
 }
 ```
 
+For Gradle 7.2.x and older, there is a [bug related to the application order of plugins](https://github.com/gradle/gradle/issues/15664) so you must use [legacy plugin application](https://plugins.gradle.org/plugin/org.jsonschema2pojo).
+
+
 Below we have a full build.gradle example, showing all available configuration options:
 
 ```groovy