Pull method DefaultPluginManager.whichPlugin() to PluginManager

pf4j/src/main/java/ro/fortsoft/pf4j/DefaultPluginManager.java

@@ -577,9 +577,7 @@ public class DefaultPluginManager implements PluginManager {
 		return runtimeMode;
 	}
 
-    /**
-     * Retrieves the {@link PluginWrapper} that loaded the given class 'clazz'.
-     */
+    @Override
     public PluginWrapper whichPlugin(Class<?> clazz) {
         ClassLoader classLoader = clazz.getClassLoader();
         for (PluginWrapper plugin : resolvedPlugins) {

pf4j/src/main/java/ro/fortsoft/pf4j/PluginManager.java

@@ -141,6 +141,11 @@ public interface PluginManager {
 	 */
 	public RuntimeMode getRuntimeMode();
 
+    /**
+     * Retrieves the {@link PluginWrapper} that loaded the given class 'clazz'.
+     */
+    public PluginWrapper whichPlugin(Class<?> clazz);
+
     public void addPluginStateListener(PluginStateListener listener);
 
     public void removePluginStateListener(PluginStateListener listener);
@@ -161,4 +166,5 @@ public interface PluginManager {
      * * @return the system version
      */
     public Version getSystemVersion();
+
 }