Update changelog

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@@ -4,6 +4,15 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog].
 
 ## Unreleased
+### Enhancements
+* There is now a maximum length for the dynamic programming algorithm,
+  controlled by `apheleia-max-alignment-size`. This prevents Emacs
+  from hanging due to Apheleia. under any circumstances ([#4]).
+
+### Formatters
+* New: [Brittany](https://hackage.haskell.org/package/brittany) for
+  [Haskell](https://www.haskell.org/).
+
 ### Bugs fixed
 * Previously, weirdness could happen if manually running Prettier via
   `M-x apheleia-format-buffer` on a buffer which was modified from
@@ -11,6 +20,23 @@ The format is based on [Keep a Changelog].
   uses the `file` keyword if the buffer is modified, since it will not
   produce correct results. This should not affect normal usage of
   Apheleia.
+* Previously, the buffer could be erased when running Apheleia from a
+  buffer that had no backing file. This has been fixed, and Apheleia
+  can run correctly on buffers both with and without backing files
+  ([#9]).
+* Previously, there were some race conditions related to switching the
+  current buffer. In particular, if you switched the current buffer
+  right after saving, or save two buffers in quick succession, then it
+  was possible for one buffer to be overwritten or to not be
+  formatted. These problems have been fixed ([#8]).
+* Previously, enabling `undo-tree-auto-save-history` caused Apheleia
+  to mark the buffer as modified after formatting. This has been
+  fixed ([#10]).
+
+[#4]: https://github.com/raxod502/apheleia/issues/4
+[#8]: https://github.com/raxod502/apheleia/issues/8
+[#9]: https://github.com/raxod502/apheleia/pull/9
+[#10]: https://github.com/raxod502/apheleia/issues/10
 
 ## 1.0 (released 2019-09-20)
 ### Added