Update changes.

changes.md

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 # Changes
 
+# v0.45.0
+
+## Compatibility Fixes
+
+During the `v0.44.0` release cycle, the workflows for testing older rack releases were accidentally dropped. As such, `v0.44.0` was not compatible with older versions of rack. This release restores compatibility with older versions of rack.
+
+Specifically, `protocol-rack` now provides `Protocol::Rack::Adapter.parse_file` to load Rack applications. Rack 2's `Rack::Builder.parse_file` returns both the application and a set of options (multi-value return). Rack 3 changed this to only return the application, as the prior multi-value return was confusing at best. This change allows `protocol-rack` to work with both versions of rack, and `falcon` adopts that interface.
+
+In addition, `falcon serve` provides two new options:
+
+1. `--[no]-restart` which controls what happens when `async-container` instances crash. By default, `falcon serve` will restart the container when it crashes. This can be disabled with `--no-restart`.
+
+2. `--graceful-stop [timeout]` which allows you to specify a timeout for graceful shutdown. This is useful when you want to stop the server, but allow existing connections to finish processing before the server stops. This feature is highly experimental and doesn't work correctly in all cases yet, but we are aiming to improve it.
+
 # v0.44.0
 
 ## Falcon Host