API changes, most recent first:
+2018-04-03 - xxxxxxx - lavu 56.13.100 - pixdesc.h
+ Deprecate AV_PIX_FMT_FLAG_PSEUDOPAL and make allocating a pseudo palette
+ optional for API users (see AV_PIX_FMT_FLAG_PSEUDOPAL doxygen for details).
+
2018-04-01 - xxxxxxx - lavc 58.17.100 - avcodec.h
Add av_packet_make_refcounted().