Add warnings to and deprecated all those Mac modules
diff --git a/Doc/library/binhex.rst b/Doc/library/binhex.rst
index 3b0485c..0049c70 100644
--- a/Doc/library/binhex.rst
+++ b/Doc/library/binhex.rst
@@ -11,6 +11,11 @@
 file and the finder information are encoded (or decoded), on other platforms
 only the data fork is handled.
 
+.. warning::
+
+   In 3.0, special Macintosh support is removed.
+
+
 The :mod:`binhex` module defines the following functions: