[commit: packages/containers] cleaned_bugfix394, master, merge-doc-target, merge-fixes-5.9, revert-408-bugfix_394: Update changelog.md (b5b9d1e)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/containers

On branches: cleaned_bugfix394,master,merge-doc-target,merge-fixes-5.9,revert-408-bugfix_394
Link       : http://git.haskell.org/packages/containers.git/commitdiff/b5b9d1ed03108959a5672a9974e33412ee3eec7a

>---------------------------------------------------------------

commit b5b9d1ed03108959a5672a9974e33412ee3eec7a
Author: David Feuer <David.Feuer at gmail.com>
Date:   Mon Sep 5 11:44:31 2016 -0400

    Update changelog.md


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b5b9d1ed03108959a5672a9974e33412ee3eec7a
 changelog.md | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/changelog.md b/changelog.md
index 8909fad..197e5b4 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,20 @@
 # Changelog for [`containers` package](http://github.com/haskell/containers)
 
+## 0.5.9.1
+
+* Planned for GHC 8.2.
+
+* Properly deprecate functions in `Data.IntMap` long documented as deprecated.
+
+* Rename several internal modules for clarity. Thanks to esoeylemez for starting
+  this process.
+
+* Make `Data.Map.fromDistinctAscList` and `Data.Map.fromDistinctDescList` more
+  eager, improving performance.
+
+* Plug space leaks in `Data.Map.Lazy.fromAscList` and
+ `Data.Map.Lazy.fromDescList` by manually inlining constant functions.
+
 ## 0.5.8.1 *Aug 2016*
 
 ### General package changes