lavfi: add a bump and docs entries for the AVOptions switch

Changelog

@@ -9,6 +9,7 @@ version 10:
   or vice versa
 - new avconv options -filter_script and -filter_complex_script, which allow a
   filtergraph description to be read from a file
+- uniform options syntax across all filters
 
 
 version 9:

doc/APIchanges

@@ -13,6 +13,12 @@ libavutil:     2012-10-22
 
 API changes, most recent first:
 
+2013-xx-xx - lavfi 3.7.0 - avfilter.h
+  Add AVFilter.priv_class for exporting filter options through the AVOptions API
+  in the similar way private options work in lavc and lavf.
+  Add avfilter_get_class().
+  Switch all filters to use AVOptions.
+
 2013-xx-xx - lavu 52.9.0 - pixdesc.h
   Add av_pix_fmt_count_planes() function for counting planes in a pixel format.
 

libavfilter/version.h

@@ -29,7 +29,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  3
-#define LIBAVFILTER_VERSION_MINOR  6
+#define LIBAVFILTER_VERSION_MINOR  7
 #define LIBAVFILTER_VERSION_MICRO  0
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \