Include the Doc/ChangeLog file in source tarballs

git-svn-id: svn://svn.code.sf.net/p/fonttools/code/trunk@572 4cde692c-a291-49d1-8350-778aa11640f8
diff --git a/MANIFEST.in b/MANIFEST.in
index 3e48c05..e1977d5 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,6 +1,7 @@
 include LICENSE.txt
 include MANIFEST.in
 include Doc/ttx.1
+include Doc/ChangeLog
 include Doc/*.txt
 include Doc/*.html
 include MetaTools/*.py