Make the Pynche tool work with Python 3.
diff --git a/Tools/pynche/TextViewer.py b/Tools/pynche/TextViewer.py
index 456bd96..baa1e62 100644
--- a/Tools/pynche/TextViewer.py
+++ b/Tools/pynche/TextViewer.py
@@ -15,7 +15,7 @@
 in the text window (which only has a background).
 """
 
-from Tkinter import *
+from tkinter import *
 import ColorDB
 
 ADDTOVIEW = 'Text Window...'