Update compatibility comments to 2.1, corresponding to PEP 291 1.13.
diff --git a/Lib/distutils/dep_util.py b/Lib/distutils/dep_util.py
index 0746633..c139c85 100644
--- a/Lib/distutils/dep_util.py
+++ b/Lib/distutils/dep_util.py
@@ -4,7 +4,7 @@
 and groups of files; also, function based entirely on such
 timestamp dependency analysis."""
 
-# This module should be kept compatible with Python 1.5.2.
+# This module should be kept compatible with Python 2.1.
 
 __revision__ = "$Id$"