changing date

2018-12-20 13:57:34 +01:00 · 2018-12-20 13:57:34 +01:00 · 00084c6f7d
--- a/news/nl/nl-201812.nl.xhtml
+++ b/news/nl/nl-201812.nl.xhtml
@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<html newsdate="2019-12-20" type="newsletter">
+<html newsdate="2018-12-20" type="newsletter">
  <head>
    <title>FSFE Nieuwsbrief - December 2018</title>
  </head>