Update NEWS for 0.3.0 - Sailfish

NEWS

-Changes for 0.2.2 'Antelope':
-----------------------------
+Changes for 0.3.0 'Sailfish':
+------------------------------
+
+This is the final release for the numerous speed improvements of 0.3.0-rc.
+It mostly:
+ - Fixes an annoying crash on SSSE3 that happened in the itx functions
+
+
+Changes for 0.2.2 (0.3.0-rc) 'Antelope':
+-----------------------------
 
  - Large improvement on MSAC decoding with SSE, bringing 4-6% speed increase
    The impact is important on SSSE3, SSE4 and AVX-2 cpus