Declare the plugin as K2 compatible

Author: RedNesto

src/main/resources/META-INF/mcdev-kotlin.xml

@@ -24,4 +24,8 @@
 
         <eventGenHelper language="kotlin" implementationClass="com.demonwav.mcdev.insight.generation.KotlinEventGenHelper"/>
     </extensions>
+
+    <extensions defaultExtensionNs="org.jetbrains.kotlin">
+        <supportsKotlinPluginMode supportsK2="true"/>
+    </extensions>
 </idea-plugin>