doc/APIchanges: Fill in missing fields

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

doc/APIchanges

@@ -15,22 +15,22 @@ libavutil:     2015-08-28
 
 API changes, most recent first:
 
-2017-04-11 - xxxxxxx - lavu 55.61.100 - avstring.h
+2017-04-11 - 8378466507 - lavu 55.61.100 - avstring.h
   Add av_strireplace().
 
-2016-04-06 - xxxxxxx - lavc 57.92.100 - avcodec.h
+2016-04-06 - 157e57a181 - lavc 57.92.100 - avcodec.h
   Add AV_PKT_DATA_CONTENT_LIGHT_LEVEL packet side data.
 
-2016-04-06 - xxxxxxx - lavu 55.60.100 - mastering_display_metadata.h
+2016-04-06 - b378f5bd64 - lavu 55.60.100 - mastering_display_metadata.h
   Add AV_FRAME_DATA_CONTENT_LIGHT_LEVEL value, av_content_light_metadata_alloc()
   and av_content_light_metadata_create_side_data() API, and AVContentLightMetadata
   type to export content light level video properties.
 
-2017-03-31 - xxxxxxx - lavu 55.57.100 - spherical.h
+2017-03-31 - 9033e8723c - lavu 55.57.100 - spherical.h
   Add av_spherical_projection_name().
   Add av_spherical_from_name().
 
-2017-03-30 - xxxxxxx - lavu 55.53.100 / 55.27.0 - hwcontext.h
+2017-03-30 - 4cda23f1f1 - lavu 55.53.100 / 55.27.0 - hwcontext.h
   Add av_hwframe_map() and associated AV_HWFRAME_MAP_* flags.
   Add av_hwframe_ctx_create_derived().
 
@@ -55,7 +55,7 @@ API changes, most recent first:
   Add AVCodecContext.hwaccel_flags field. This will control some hwaccels at
   a later point.
 
-2017-03-21 - xxxxxxx - lavf 57.67.100 / 57.08.0 - avio.h
+2017-03-21 - fc9f14c7de - lavf 57.67.100 / 57.08.0 - avio.h
   Add AVIO_SEEKABLE_TIME flag.
 
 2017-03-21 - d682ae70b4 - lavf 57.66.105, lavc 57.83.101 - avformat.h, avcodec.h
@@ -63,7 +63,7 @@ API changes, most recent first:
   bump, and libavformat will behave as if it were always set.
   Deprecate av_packet_merge_side_data() and av_packet_split_side_data().
 
-2016-03-20 - xxxxxxx - lavu 55.50.100 / 55.21.0 - imgutils.h
+2016-03-20 - 8200b16a9c - lavu 55.50.100 / 55.21.0 - imgutils.h
   Add av_image_copy_uc_from(), a version of av_image_copy() for copying
   from GPU mapped memory.
 
@@ -74,7 +74,7 @@ API changes, most recent first:
   Deprecate AVFilterGraph.resample_lavr_opts
   It's never been used by avfilter nor passed to anything.
 
-2017-02-10 - xxxxxxx - lavu 55.48.100 / 55.33.0 - spherical.h
+2017-02-10 - 1b7ffddb3a - lavu 55.48.100 / 55.33.0 - spherical.h
   Add AV_SPHERICAL_EQUIRECTANGULAR_TILE, av_spherical_tile_bounds(),
   and projection-specific properties (bound_left, bound_top, bound_right,
   bound_bottom, padding) to AVSphericalMapping.
@@ -94,7 +94,7 @@ API changes, most recent first:
 2017-02-11 - e3af49b14b - lavu 55.47.100 - frame.h
   Add AVFrame.opaque_ref.
 
-2017-01-31 - xxxxxxx - lavu 55.46.100 / 55.20.0 - cpu.h
+2017-01-31 - 2eab48177d - lavu 55.46.100 / 55.20.0 - cpu.h
   Add AV_CPU_FLAG_SSSE3SLOW.
 
 2017-01-24 - c4618f842a - lavu 55.45.100 - channel_layout.h
@@ -107,20 +107,20 @@ API changes, most recent first:
   Deprecate struct vaapi_context and the vaapi.h installed header.
   Callers should set AVCodecContext.hw_frames_ctx instead.
 
-2017-01-12 - dbe9dbed31 - lavfi 6.69.100- buffersink.h
+2017-01-12 - dbe9dbed31 - lavfi 6.69.100 - buffersink.h
   Add av_buffersink_get_*() functions.
 
-2017-01-06 - 9488032e10 - lavf 57.62.100- avio.h
+2017-01-06 - 9488032e10 - lavf 57.62.100 - avio.h
   Add avio_get_dyn_buf()
 
-2016-12-10 - xxxxxxx - lavu xx.xx.100- imgutils.h
+2016-12-10 - f542b152aa - lavu 55.43.100 - imgutils.h
   Add av_image_check_size2()
 
-2016-xx-xx - xxxxxxx - lavc 57.67.100 / 57.29.0 - avcodec.h
+2016-12-07 - e7a6f8c972 - lavc 57.67.100 / 57.29.0 - avcodec.h
   Add AV_PKT_DATA_SPHERICAL packet side data to export AVSphericalMapping
   information from containers.
 
-2016-xx-xx - xxxxxxx - lavu 55.42.100 / 55.30.0 - spherical.h
+2016-12-07 - 8f58ecc344 - lavu 55.42.100 / 55.30.0 - spherical.h
   Add AV_FRAME_DATA_SPHERICAL value, av_spherical_alloc() API and
   AVSphericalMapping type to export and describe spherical video properties.