Update CHANGELOG.md

CHANGELOG.md

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 # Mattermost Desktop Application Changelog
 
+## Release v3.7.1
+
+Release date: August 30, 2017
+
+This release contains a security update and it is highly recommended that users upgrade to this version.
+
+### Improvements and Bug Fixes
+
+#### Windows
+
+ - [Windows 10] Client no longer freezes intermittently, such as when receiving desktop notifications. [#494](https://github.com/mattermost/desktop/issues/494), [#520](https://github.com/mattermost/desktop/issues/520)
+  - [Windows 10] Added support for running the desktop app across monitors of different DPI. [#357](https://github.com/mattermost/desktop/issues/357)
+ - [Windows 7/8] Clicking on a desktop notification now opens the message. [#67](https://github.com/mattermost/desktop/issues/67)
+
+----
+
 ## Release v3.7.0
 
 Release date: May 9, 2017