Remove deprecated constructor

pf4j/src/main/java/org/pf4j/DefaultPluginManager.java

 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.io.File;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 
         super();
     }
 
-    /**
-     * Use {@link DefaultPluginManager#DefaultPluginManager(Path)}.
-     *
-     * @param pluginsDir
-     */
-    @Deprecated
-    public DefaultPluginManager(File pluginsDir) {
-        this(pluginsDir.toPath());
-    }
-
     public DefaultPluginManager(Path pluginsRoot) {
         super(pluginsRoot);
     }