Update changelog

Author: JoeOsborn

CHANGES.md

@@ -36,6 +36,8 @@
 - INPUT/BSV/REPLAY: Add checkpoint and initial savestate compression, following the `savestate_file_compression` config boolean.  Use zstd if available, or fall back to zlib.
 - INPUT/BSV/REPLAY: Add incremental checkpoints based on statestreams (depending on `HAVE_STATESTREAM` compile time flag).  As an example, 60 `pcsx_rearmed` savestates would take 267MB uncompressed; with incremental encoding this is reduced to 77MB.  Compressing the result can reduce the size to just 4MB.
 - INPUT/BSV/REPLAY: Checkpoint compression and encoding can be combined. For example, 60 `pcsx_rearmed` checkpoints can take up just 15MB if each state is incremental and compressed. This is not as optimal as using incremental states without save state compression followed by offline compression, but is a good compromise in many use cases.
+- INPUT/BSV/REPLAY: Add hotkeys and text commands to force a checkpoint insertion into the currently recording replay, and to seek backwards to the previous checkpoint and forwards to the next checkpoint.
+- INPUT/BSV/REPLAY: Add a text command to seek to a specific frame of the currently playing/recording replay; it will return via the command replier the actual seeked-to frame (right now it only supports seeking to checkpoints).
 - INTL: Add Irish Gaelic to selectable languages
 - IOS: Fix crash on iOS9 when fetching refresh rate
 - LINUX: Add full complement of key/value pairs to desktop entry