Update NEWS (crop, padd and canvas changes in transcode).

NEWS

@@ -41,6 +41,12 @@ Important notes:
    states: IDLE/CLOSE=0, OPENING=1, BUFFERING=2, PLAYING=3, PAUSED=4, STOPPING=5,
    FORWARD=6, BACKWARD=7, ENDED=8, ERROR=9. With FORWARD and BACKWARD being
    reserved for future implementations and are thus not functional atm.
+ * Croping and padding in transcode are now done using the croppadd video
+   filter. For example:
+   transcode{vcodec=mp2v,vfilter=croppadd{cropttop=20,cropbottom=30,paddleft=100}}
+ * Canvas setting in transcode is now done using the canvas video filter.
+   For example:
+   transcode{vcodec=mp2v,vfilter=canvas{width=640,height=480}}
 
 Changes:
 --------
@@ -154,6 +160,7 @@ Video outputs and filters:
  * Add rotate-deciangle for more precision on rotate filter
  * Support for Intel SSE2 instruction set in chroma converters
  * Improved use of Intel MMX instruction set in chroma converters
+ * New croppadd and canvas video filters.
 
 Audio outputs and filters:
  * Replay gain support