Change: Update ownCloud Web to v1.0.0-beta4

Tags: web

We updated ownCloud Web to v1.0.0-beta4. Please refer to the changelog (linked) for details on the web release.

https://github.com/owncloud/ocis/pull/1110
https://github.com/owncloud/phoenix/releases/tag/v1.0.0-beta4
