update NEWS for libva-utils 2.4.0

libva-utils 2.4.0 will be branch from this commit
master version will be bumped to 2.5.0.pre1

Signed-off-by: intel <carl.zhang@intel.com>

NEWS

@@ -1,5 +1,9 @@
 libva-utils NEWS -- summary of changes.  2018-09-30
 Copyright (C) 2009-2018 Intel Corporation
+Version 2.4.0 - 1.Feb.2019
+fix make dist issue caused by decode streamout sample
+add VP sample for Blending.
+add VP seperate sample for scaling,csc,sharpness,denoise,chromasitting.
 
 Version 2.3.0 - 30.Sep.2018
 add HEVC encode sample code