fix: ライブラリとして運用した際のJavaPluginが取得できない問題を修正

src/main/kotlin/net/hareworks/kommand-lib/Kommand.kt

@@ -11,6 +11,7 @@ import org.bukkit.command.CommandMap
 import org.bukkit.command.CommandSender
 import org.bukkit.command.PluginCommand
 import org.bukkit.command.TabCompleter
+import org.bukkit.plugin.Plugin
 import org.bukkit.plugin.java.JavaPlugin
 
 fun kommand(plugin: JavaPlugin, block: KommandRegistry.() -> Unit): KommandLib {
@@ -68,7 +69,7 @@ class KommandLib internal constructor(
     }
 
     private fun newPluginCommand(name: String): PluginCommand {
-        val constructor = PluginCommand::class.java.getDeclaredConstructor(String::class.java, JavaPlugin::class.java)
+        val constructor = PluginCommand::class.java.getDeclaredConstructor(String::class.java, Plugin::class.java)
         constructor.isAccessible = true
         return constructor.newInstance(name, plugin)
     }