release 21

Author: AlmasB

README.md

@@ -21,7 +21,7 @@ JavaFX Game Development Framework
 ### Why FXGL?
 
 * No installation or setup is required
-* "Out of the box": Java 8-17, Win/Mac/Linux/Android 8+/iOS 11.0+/Web
+* "Out of the box": Java 8-21, Win/Mac/Linux/Android 8+/iOS 11.0+/Web
 * Simple and clean API, higher level than other engines
 * Superset of JavaFX: no need to learn new UI API
 * Real-world game development techniques: Entity-Component, interpolated animations, particles, and [many more](https://github.com/AlmasB/FXGL/wiki/Core-Features)
@@ -60,7 +60,7 @@ For a quick dive into code, see standalone [basic examples](https://github.com/A
 
 Otherwise, see:
 
-* [FXGL 17 book](https://link.springer.com/book/10.1007/978-1-4842-8625-8?sap-outbound-id=3352BB472E8E602B4B29844F1A86CCC4374DDF6E)
+* [FXGL book](https://link.springer.com/book/10.1007/978-1-4842-8625-8?sap-outbound-id=3352BB472E8E602B4B29844F1A86CCC4374DDF6E)
 * [Showcase Trailer](https://youtu.be/fuDQg7W0v4g)
 * [Use FXGL with IntelliJ](https://youtu.be/LhmlFC6KE2Q)
 * [Wiki & written tutorials](https://github.com/AlmasB/FXGL/wiki)
@@ -71,23 +71,19 @@ Otherwise, see:
 
 ### Maven
 
-* [Maven](https://github.com/AlmasB/FXGL-MavenGradle) template project if you use Java and/or Kotlin (Java 17+)
-
-Make sure to set `<release>17</release>` for `maven-compiler-plugin`.
+* [Maven](https://github.com/AlmasB/FXGL-MavenGradle) template project if you use Java and/or Kotlin
 
 ```xml
 <dependency>
     <groupId>com.github.almasb</groupId>
     <artifactId>fxgl</artifactId>
-    <version>17.3</version>
+    <version>21</version>
 </dependency>
 ```
 
-Note: use `0.5.4` for Java 8-10 and `17.3` for Java 11+.
-
 ### Gradle
 
-* [Gradle](https://github.com/AlmasB/FXGL-MavenGradle) template project if you use Java and/or Kotlin (Java 17+)
+* [Gradle](https://github.com/AlmasB/FXGL-MavenGradle) template project if you use Java and/or Kotlin
 
 Please refer to the template if there are any errors.
 
@@ -97,12 +93,10 @@ repositories {
 }
 
 dependencies {
-    compile 'com.github.almasb:fxgl:17.3'
+    compile 'com.github.almasb:fxgl:21'
 }
 ```
 
-Note: use `0.5.4` for Java 8-10 and `17.3` for Java 11+.
-
 ### Modularity
 
 If you wish to develop a modular application, here's a complete example of your `module-info.java`:

README_CN.md

@@ -18,7 +18,7 @@ JavaFX 游戏开发框架
 ## 为什么选择FXGL ?
 
 - 无需安装或设置
-- “开箱即用”：Java 8-17、Win/Mac/Linux/Android 8+/iOS 11.0+/Web
+- “开箱即用”：Java 8-21、Win/Mac/Linux/Android 8+/iOS 11.0+/Web
 - 简单干净的API，相比起其他引擎API级别更高
 - JavaFX 的超集：无需学习新的 UI API
 - 真实世界的游戏开发技术：实体组件、插值动画、粒子[等等](https://github.com/AlmasB/FXGL/wiki/Core-Features)
@@ -55,7 +55,7 @@ public class BasicGameApp extends GameApplication {
 
 如需快速深入了解代码，请参阅独立的[基本示例](https://github.com/AlmasB/FXGL/tree/dev/fxgl-samples/src/main/java/basics)。否则，请参阅：
 
-- [FXGL 17 书](https://link.springer.com/book/10.1007/978-1-4842-8625-8?sap-outbound-id=3352BB472E8E602B4B29844F1A86CCC4374DDF6E)
+- [FXGL 书](https://link.springer.com/book/10.1007/978-1-4842-8625-8?sap-outbound-id=3352BB472E8E602B4B29844F1A86CCC4374DDF6E)
 - [预告片展示](https://youtu.be/fuDQg7W0v4g)
 - [在IntelliJ中使用FXGL](https://youtu.be/LhmlFC6KE2Q)
 - [维基和书面教程](https://github.com/AlmasB/FXGL/wiki)
@@ -66,23 +66,19 @@ public class BasicGameApp extends GameApplication {
 
 ### Maven
 
-- [Maven](https://github.com/AlmasB/FXGL-MavenGradle)项目模板，编程语言为 Java 和/或 Kotlin (Java 17+)
-
-确保设置`<release>17</release>`为`maven-compiler-plugin`.
+- [Maven](https://github.com/AlmasB/FXGL-MavenGradle)项目模板，编程语言为 Java 和/或 Kotlin
 
 ```
 <dependency>
     <groupId>com.github.almasb</groupId>
     <artifactId>fxgl</artifactId>
-    <version>17.3</version>
+    <version>21</version>
 </dependency>
 ```
 
-注意：`0.5.4` 及 `17.3` 分别适用于 Java 8-10  及 Java 11+。
-
 ### Gradle
 
-- [Gradle项目模板](https://github.com/AlmasB/FXGL-MavenGradle)，编程语言为 Java 和/或 Kotlin (Java 17+)
+- [Gradle项目模板](https://github.com/AlmasB/FXGL-MavenGradle)，编程语言为 Java 和/或 Kotlin
 
 如有错误请以模板为准。
 
@@ -92,12 +88,10 @@ repositories {
 }
 
 dependencies {
-    compile 'com.github.almasb:fxgl:17.3'
+    compile 'com.github.almasb:fxgl:21'
 }
 ```
 
-注意：`0.5.4` 及 `17.3` 分别适用于 Java 8-10  及 Java 11+。
-
 ### 模块化
 
 如果您希望开发模块化应用程序，这里有一个完整的示例`module-info.java`：