lavf: add a missing bump and APIchanges for the codecpar switch

doc/APIchanges

@@ -13,6 +13,9 @@ libavutil:     2015-08-28
 
 API changes, most recent first:
 
+2016-02-23 - 9200514 - lavf 57.5.0 - avformat.h
+  Add AVStream.codecpar, deprecate AVStream.codec.
+
 2016-xx-xx - lavc 57.14.0 - avcodec.h
   xxxxxxx - Add AVCodecParameters and its related API.
   xxxxxxx - Add av_get_audio_frame_duration2().

libavformat/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFORMAT_VERSION_MAJOR 57
-#define LIBAVFORMAT_VERSION_MINOR  4
+#define LIBAVFORMAT_VERSION_MINOR  5
 #define LIBAVFORMAT_VERSION_MICRO  0
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \