Update changelog

CHANGELOG.md

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 Thanks to all contributers who improved notistack by opening an issue/PR.
 
-### `[email protected].8`
+### `[email protected].9`
 ###### to be published
 * **@pctestjfarz**: Add swipe to dismiss feature [#138](https://github.com/iamhosseindhv/notistack/issues/138) 
 * **@molynerd**: Add support to update content of snackbar in place [#50](https://github.com/iamhosseindhv/notistack/issues/50)
 * **@david-chau**: Allow `asc`, `desc` or custom sort order of snackbars [#160](https://github.com/iamhosseindhv/notistack/issues/160)
-* **@madaz**: Add higher priority to Snackbar styles [#202](https://github.com/iamhosseindhv/notistack/issues/202)
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+<br />
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+### `[email protected]`
+###### Feb 23, 2020
 * **@svish**: Correct enqueueSnackbar typing [#217](https://github.com/iamhosseindhv/notistack/issues/217)
 * **@dgczhh**: Make sure `onClose` callback that's been passed through options parameter of `enqueueSnackbar` gets called when snackbar is closed using `closeSnackbar` function [#220](https://github.com/iamhosseindhv/notistack/issues/220)
+* **@JoseLion**: Add snackbar key to transition handler parameters. Fix transition handler callback types [#214](https://github.com/iamhosseindhv/notistack/issues/214)
 
 
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