Add NEWS entry for last commit

Author: maxauthority

vimperator/NEWS

@@ -1,5 +1,11 @@
 2015-xx-xx
     * Version 3.8.4
+    * We don't override <S-Insert> in textboxes anymore, so it does the default
+      action (which is pasting the clipboard). For Windows and Mac users, this doesn't
+      change anything. For Linux, this means it pasts the clipboard instead of the X11
+      selection, but that's actually also the default for most GUI apps on Linux nowadays.
+      On the other hand, it also fixes an annying bug where the first completion stayed
+      active when using <S-Insert> in the command line.
     * Finally remove local file completions from the :open prompt which causes lots of problems (and
       slowdowns) for many people. If you want them back, use :set complete=slf
       to get back the old default value.