Add JDK version check

settings.gradle

@@ -8,7 +8,14 @@ include(':mirai-demos:mirai-demo-1')
 include(':mirai-demos:mirai-demo-gentleman')
 include(':mirai-demos')
 include(':mirai-demos:mirai-demo-android')
-include(':mirai-debug')
+
+def javaVersion = System.getProperty("java.version")
+if (javaVersion.substring(0, javaVersion.indexOf(".")).toInteger() >= 11) {
+    include(':mirai-debug')
+} else {
+    println("当前使用的 JDK 版本为 ${System.getProperty("java.version")}, 最低需要 JDK 11 才能引入模块 `:mirai-debug`")
+}
+
 project(':mirai-demos:mirai-demo-1').projectDir = file('mirai-demos/mirai-demo-1')
 project(':mirai-demos:mirai-demo-gentleman').projectDir = file('mirai-demos/mirai-demo-gentleman')
 project(':mirai-demos:mirai-demo-android').projectDir = file('mirai-demos/mirai-demo-android')