fix kdoc Module

buildSrc/src/main/kotlin/simbot.dokka-module-configuration.gradle.kts

@@ -4,7 +4,7 @@
  *     Project    https://github.com/simple-robot/simpler-robot
  *     Email      [email protected]
  *
- *     This file is part of the Simple Robot Library.
+ *     This file is part of the Simple Robot Library (Alias: simple-robot, simbot, etc.).
  *
  *     This program is free software: you can redistribute it and/or modify
  *     it under the terms of the GNU Lesser General Public License as published by
@@ -77,10 +77,11 @@ tasks.withType<org.jetbrains.dokka.gradle.DokkaTaskPartial>().configureEach {
             } ?: JVMConstants.KT_JVM_TARGET_VALUE
 
         jdkVersion.set(jdkVersionValue)
-        if (project.file("Module.md").exists()) {
-            includes.from("Module.md")
-        } else if (project.file("README.md").exists()) {
-            includes.from("README.md")
+        val moduleFile = project.file("Module.md")
+        if (moduleFile.exists()) {
+            if (moduleFile.length() > 0) {
+                includes.from("Module.md")
+            }
         }
 
         sourceLink {