doc: fix date for 8.0.0 changelog

Fixes #13356

PR-URL: https://github.com/nodejs/node/pull/13360
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/changelogs/CHANGELOG_V8.md

@@ -22,7 +22,7 @@
   * [Archive](CHANGELOG_ARCHIVE.md)
 
 <a id="8.0.0"></a>
-## 2017-04-25, Version 8.0.0 (Current), @jasnell
+## 2017-05-30, Version 8.0.0 (Current), @jasnell
 
 Node.js 8.0.0 is a major new release that includes a significant number of
 `semver-major` and `semver-minor` changes. Notable changes are listed below.