Add merged community PR to changelog.

Author: T4rk1n

CHANGELOG.md

@@ -2,6 +2,9 @@
 ## Added
 - Added support for serving dev bundles from the components suite, enable with `app.run_server(dev_tools_serve_dev_bundles=True)` [#369](https://github.com/plotly/dash/pull/369)
 
+## Fixed
+- Use HTML5 syntax for the meta tag [#350](https://github.com/plotly/dash/pull/350)
+
 ## 0.26.6 - 2018-09-19
 ## Fixed
 - Added `Cache-Control` headers to files served by `Dash.serve_component_suites`. [#387](https://github.com/plotly/dash/pull/387)