lavfi: bump minor and add changelog entry after the split filter addition

Changelog

@@ -17,6 +17,7 @@ version <next>:
 - Apple Core Audio Format muxer
 - 9bit and 10bit H.264 decoding
 - 9bit and 10bit FFV1 encoding / decoding
+- split filter added
 
 
 version 0.7_beta1:

libavfilter/avfilter.h

@@ -26,7 +26,7 @@
 #include "libavutil/samplefmt.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  2
-#define LIBAVFILTER_VERSION_MINOR  8
+#define LIBAVFILTER_VERSION_MINOR  9
 #define LIBAVFILTER_VERSION_MICRO  0
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \