Sync with 2.0.4

* maint:
  Git 2.0.4
  commit --amend: test specifies authorship but forgets to check

Documentation/RelNotes/2.0.4.txt

+Git v2.0.4 Release Notes
+========================
+
+ * An earlier update to v2.0.2 broken output from "git diff-tree",
+   which is fixed in this release.

Documentation/git.txt

@@ -43,9 +43,10 @@ unreleased) version of Git, that is available from the 'master'
 branch of the `git.git` repository.
 Documentation for older releases are available here:
 
-* link:v2.0.3/git.html[documentation for release 2.0.3]
+* link:v2.0.4/git.html[documentation for release 2.0.4]
 
 * release notes for
+  link:RelNotes/2.0.4.txt[2.0.4],
   link:RelNotes/2.0.3.txt[2.0.3],
   link:RelNotes/2.0.2.txt[2.0.2],
   link:RelNotes/2.0.1.txt[2.0.1],

t/t7509-commit.sh

@@ -77,6 +77,7 @@ test_expect_success '--amend option copies authorship' '
 	git commit -a --amend -m "amend test" &&
 	author_header Initial >expect &&
 	author_header HEAD >actual &&
+	test_cmp expect actual &&
 
 	echo "amend test" >expect &&
 	message_body HEAD >actual &&