docs: update changelog

MrWolfZ · Jan 11, 2019 · 1e9ebfe · 1e9ebfe
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diff --git a/CHANGELOG.md b/CHANGELOG.md
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 ## ngrx-forms Changelog
 
+<a name="4.0.1"></a>
+### 4.0.1
+
+#### Bugfixes
+
+* allow boxed `undefined` values as form control values ([ab5ff58](https://github.com/MrWolfZ/ngrx-forms/commit/ab5ff58)), thanks @dzonatan for reporting this bug, closes [#131](https://github.com/MrWolfZ/ngrx-forms/issues/131)
+
 <a name="4.0.0"></a>
 ### 4.0.0