Mention in NEWS the relicensing

(cherry picked from commit 74f2f90a8e8bbfd2b527c947dd9fe68517992057)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

NEWS

@@ -2,6 +2,7 @@ Changes between 1.1.x and 1.2.0-pre3:
 ------------------------------------
 
 Important notes:
+ * The licenses of libVLC and libVLCcore have changed from GPLv2+ to LGPLv2.1+
  * Start/end titles/chapters are now specified with # rather than @ to fix
    conflicts with some URLs and file names. For instance, this plays a DVD
    from the 2nd chapter of the 1st title up to the 4th chapter of the 3rd