fix bug in fibonacci pattern

extensions/fablabchemnitz/fibonacci_pattern/fibonacci_pattern.py

@@ -72,15 +72,15 @@ class FibonacciPattern(inkex.EffectExtension):
         pars.add_argument("-s", "--SpreadFactor",type=int, default="10", help="This will create a larger spread between the nodes from the center.")
 
     def effect(self):
-        # Foreach Node
+
+        group = self.document.getroot().add(inkex.Group(id="fibonacci-pattern-" + self.svg.get_unique_id("")))
         for k in range(1,self.options.NumberOfNodes):
-            # Draw the circle
             drawKthCircle(k,
                 self.options.FirstRadius,
                 self.options.LastRadius,
                 self.options.NumberOfNodes,
                 self.options.SpreadFactor,
-                self.svg.get_current_layer())
+                group)
 
 if __name__ == '__main__':
     FibonacciPattern().run()