Prepare release

CHANGES.md

@@ -1,3 +1,55 @@
+## v0.3
+
+API changes:
+
+- `Net.accept_sub` is deprecated in favour of `accept_fork` (@talex5 #240).  
+  `Fiber.fork_on_accept`, which it used internally, has been removed.
+
+- Allow short writes in `Read_source_buffer` (@talex5 #239).  
+  The reader is no longer required to consume all the data in one go.
+  Also, add `Linux_eio.Low_level.writev_single` to expose this behaviour directly.
+
+- `Eio.Unix_perm` is now `Eio.Dir.Unix_perm`.
+
+New features:
+
+- Add `Eio.Mutex` (@TheLortex @talex5 #223).
+
+- Add `Eio.Buf_write` (@talex5 #235).  
+  This is a buffered writer for Eio sinks, based on Faraday.
+
+- Add `Eio_mock` library for testing (@talex5 #228).  
+  At the moment it has mock flows and networks.
+
+- Add `Eio_mock.Backend` (@talex5 #237 #238).  
+  Allows running tests without needing a dependency on eio_main.
+  Also, as it is single-threaded, it can detect deadlocks in test code instead of just hanging.
+
+- Add `Buf_read.{of_buffer, of_string, parse_string{,_exn}, return}` (@talex5 #225).
+
+- Add `<*>` combinator to `Buf_read.Syntax` (@talex5 #227).
+
+- Add `Eio.Dir.read_dir` (@patricoferris @talex5 #207 #218 #219)
+
+Performance:
+
+- Add `Buf_read` benchmark and optimise it a bit (@talex5 #230).
+
+- Inline `Buf_read.consume` to improve performance (@talex5 #232).
+
+Bug fixes / minor changes:
+
+- Allow IO to happen even if a fiber keeps yielding (@TheLortex @talex5 #213).
+
+- Fallback for `traceln` without an effect handler (@talex5 #226).  
+  `traceln` now works outside of an event loop too.
+
+- Check for cancellation when creating a non-protected child context (@talex5 #222).
+
+- eio_linux: handle EINTR when calling `getrandom` (@bikallem #212).
+
+- Update to cmdliner.1.1.0 (@talex5 #190).
+
 ## v0.2
 
 - Add support for UDP (@patricoferris #171).