Update NEWS for 3.0.18-rc2

Update news, and bump version to 3.0.18-rc2.

NEWS

@@ -1,12 +1,27 @@
-Changes between 3.0.18-rc and 3.0.18:
+Changes between 3.0.18-rc and 3.0.18-rc2:
 -------------------------------------
 
-Demux:
+Codec/Demux:
+ * Add support for Y16 chroma
  * Fix build of gme plugin
 
+Lua:
+ * Fix script for vocaroo
+ * Fix script for youtube to allow throttled playback
+   (Note: Restrictions on youtube still prevent unthrottled playback)
+
+Service Discovery:
+ * Fix UPnP regression on Windows
+
 Video Output:
  * Fix video placement with caopengllayer
 
+Misc:
+ * Fix password search in kwallet module
+
+Contribs:
+ * Update FFmpeg
+
 
 Changes between 3.0.17.4 and 3.0.18-rc:
 --------------------------------------

configure.ac

@@ -7,7 +7,7 @@ VERSION_MAJOR=3
 VERSION_MINOR=0
 VERSION_REVISION=18
 VERSION_EXTRA=0
-VERSION_DEV=
+VERSION_DEV=rc2
 
 PKGDIR="vlc"
 AC_SUBST(PKGDIR)