changelog: fix 7.0.0 release date
We date was the same as 6.8.0 for some unkown reason. We now use the date of the
tag.
--- a/CHANGELOG Fri Nov 17 00:48:08 2017 +0100
+++ b/CHANGELOG Sun Nov 19 04:47:10 2017 +0100
@@ -15,7 +15,7 @@
* fix new-heads check when pushing new topic with --publish.
-7.0.0 -- 2017-10-23
+7.0.0 -- 2017-11-02
-------------------
* drop compatibility with Mercurial 3.8, 3.9 and 4.0,