Doc: generate Changelog for 2011

(cherry picked from commit e697532e66ce7ad886fd2c526f7e2c777e88bcc9)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

doc/Makefile.am

@@ -19,6 +19,7 @@ CHANGELOGS = \
 	ChangeLog-2008 \
 	ChangeLog-2009 \
 	ChangeLog-2010 \
+	ChangeLog-2011 \
 	$(NULL)
 
 man1_MANS = \