Issue #10783: struct.pack() doesn't encode implicitly unicode to UTF-8

 * Replace "bytes" by "bytes object" in struct error messages
 * Document the API change in What's new in Python 3.2
 * Fix test_wave
 * Remove also ugly implicit conversions in test_struct
diff --git a/Misc/NEWS b/Misc/NEWS
index 9a527e3..e16cdb8 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -18,6 +18,9 @@
 Library
 -------
 
+- Issue #10783: struct.pack() doesn't encode implicitly unicode to UTF-8
+  anymore.
+
 - Issue #10730: Add SVG mime types to mimetypes module.
 
 - Issue #10768: Make the Tkinter ScrolledText widget work again.