avfilter: bump minor and add Changelog entry

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Changelog

@@ -17,6 +17,7 @@ version <next>:
 - Intel QSV-accelerated MPEG-2 video and HEVC encoding
 - libkvazaar HEVC encoder
 - erosion, dilation, deflate and inflate video filters
+- Dynamic Audio Normalizer as dynaudnorm filter
 
 
 version 2.7:

libavfilter/version.h

@@ -30,8 +30,8 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  5
-#define LIBAVFILTER_VERSION_MINOR  22
-#define LIBAVFILTER_VERSION_MICRO 101
+#define LIBAVFILTER_VERSION_MINOR  23
+#define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \