v0.4

Add --cpu option (@talex5 #41).
Useful to avoid running eio-trace on the same CPU as the program being traced.
Fix ring height calculation (again) (@talex5 #42).
Link to performance problems blog post (@talex5 #40).
Gives examples showing uses of eio-trace and other tools.
Add gc-stats sub-command (@talex5 #39).
Report about time spent in GC for a recorded trace.

v0.3

Ensure ring height is at least 1 (@talex5 #36).
Non-Eio rings that don't have any events didn't get the correct height.
Optimise redraw (@talex5 #37).

Fix staircasing in layout (@talex5 #28).
Instead of placing a new fiber below all overlapping fibers, place it in the first large-enough gap.
Allow setting viewport values explicitly (@talex5 #29).
Press s to see or edit the start time. Press d to see or edit the duration time. Useful to find values for command-line rendering or to ensure that images have the same scale for comparison.
Add a popup menu (@talex5 #31).
Add Reload feature (@talex5 #27, #33).
With eio-trace run the window opens after 1 second. Press F5 to get further updates.
Add Export image to GTK UI (@talex5 #32).
Show GC running in red (@talex5 #30).
This makes it easier to see the difference between domains actively running GC vs waiting for other domains to be ready.
Update README now that eio-trace is released (@talex5 #26).
Explain what to do about lost events (@talex5 #34).