lavu: Add version information for av_version_info()

Move the APIchange entry at the top.

doc/APIchanges

@@ -13,15 +13,15 @@ libavutil:     2014-08-09
 
 API changes, most recent first:
 
+2015-xx-xx - xxxxxxx - lavu 56.15.0
+  Add av_version_info().
+
 2015-xx-xx - xxxxxxx - lavf 56.20.0 - avio.h
   Add avio_put_str16be.
 
 2015-xx-xx - xxxxxxx - lavu 54.14.0 - cpu.h
   Add AV_CPU_FLAG_AVXSLOW.
 
-2015-xx-xx - xxxxxxx - lavu 56.xx.0
-  Add av_version_info().
-
 2015-xx-xx - xxxxxxx - lavc 56.23.0
   Add av_vda_default_init2.
 

libavutil/version.h

@@ -54,7 +54,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR 54
-#define LIBAVUTIL_VERSION_MINOR 14
+#define LIBAVUTIL_VERSION_MINOR 15
 #define LIBAVUTIL_VERSION_MICRO  0
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \