Update plot.py to pass subtree to get_lines

Change needed to allow custom coloring of the dendrogram subtrees.

astrodendro/plot.py

@@ -100,7 +100,7 @@ def plot_tree(self, ax, structure=None, subtree=True, autoscale=True, **kwargs):
         """
 
         # Get the lines for the dendrogram
-        lines = self.get_lines(structures=structure, **kwargs)
+        lines = self.get_lines(structures=structure, subtree=subtree, **kwargs)
 
         # Add the lines to the axes
         ax.add_collection(lines)