All the tests already seem to run on sqlite, so there (in my mind) is no reason to not provide support for it.
The only change needed was to lower the delete chunk size.
Bumps [pusher/pusher-php-server](https://github.com/pusher/pusher-http-php) from 3.3.1 to 3.4.1.
<details>
<summary>Release notes</summary>
*Sourced from [pusher/pusher-php-server's releases](https://github.com/pusher/pusher-http-php/releases).*
> ## v3.4.1
> [ADDED] Support for PHP 7.3.
>
> ## v3.4.0
> [ADDED] `get_users_info` method.
</details>
<details>
<summary>Changelog</summary>
*Sourced from [pusher/pusher-php-server's changelog](https://github.com/pusher/pusher-http-php/blob/master/CHANGELOG.md).*
> ## 3.4.1 (2019-03-18)
>
> [ADDED] Support for PHP 7.3.
>
> ## 3.4.0 (2019-03-11)
>
> [ADDED] `get_users_info` method.
</details>
<details>
<summary>Commits</summary>
- [`a5fcdc6`](a5fcdc65ef) Merge pull request [#214](https://github-redirect.dependabot.com/pusher/pusher-http-php/issues/214) from pusher/v341-release
- [`4e6d35f`](4e6d35f7ee) v3.4.1 release
- [`f965ee5`](f965ee5d08) Merge pull request [#212](https://github-redirect.dependabot.com/pusher/pusher-http-php/issues/212) from GrahamCampbell/patch-1
- [`a30d364`](a30d364f6c) Fix composer.json
- [`9093be6`](9093be6934) Merge pull request [#210](https://github-redirect.dependabot.com/pusher/pusher-http-php/issues/210) from pusher/v340-release
- [`78642a8`](78642a8802) v3.4.0 release
- [`55e33e6`](55e33e6b62) Merge pull request [#209](https://github-redirect.dependabot.com/pusher/pusher-http-php/issues/209) from pusher/add-get-users-info-method
- [`9646aa4`](9646aa414e) Merge pull request [#208](https://github-redirect.dependabot.com/pusher/pusher-http-php/issues/208) from pusher/test-against-php73
- [`26bc343`](26bc3439c7) Add get_users_info method
- [`c124ff3`](c124ff359f) Test against PHP 7.3
- Additional commits viewable in [compare view](https://github.com/pusher/pusher-http-php/compare/v3.3.1...v3.4.1)
</details>
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