Remove OpenCollective since the Foundation will shut down in september.

Use GH Sponsors instead

.github/FUNDING.yml

@@ -1,2 +1 @@
-open_collective: zipstream
 github: maennchen

README.md

@@ -150,34 +150,3 @@ See: https://www.php.net/supported-versions.php
 - Jesse G. Donat <donatj@gmail.com> - https://donatstudios.com
 - Nicolas CARPi <nico-git@deltablot.email> - https://www.deltablot.com
 - Nik Barham <nik@brokencube.co.uk> - https://www.brokencube.co.uk
-
-## Contributors
-
-### Code Contributors
-
-This project exists thanks to all the people who contribute.
-[[Contribute](.github/CONTRIBUTING.md)].
-<a href="https://github.com/maennchen/ZipStream-PHP/graphs/contributors"><img src="https://opencollective.com/zipstream/contributors.svg?width=890&button=false" /></a>
-
-### Financial Contributors
-
-Become a financial contributor and help us sustain our community. [[Contribute](https://opencollective.com/zipstream/contribute)]
-
-#### Individuals
-
-<a href="https://opencollective.com/zipstream"><img src="https://opencollective.com/zipstream/individuals.svg?width=890"></a>
-
-#### Organizations
-
-Support this project with your organization. Your logo will show up here with a link to your website. [[Contribute](https://opencollective.com/zipstream/contribute)]
-
-<a href="https://opencollective.com/zipstream/organization/0/website"><img src="https://opencollective.com/zipstream/organization/0/avatar.svg"></a>
-<a href="https://opencollective.com/zipstream/organization/1/website"><img src="https://opencollective.com/zipstream/organization/1/avatar.svg"></a>
-<a href="https://opencollective.com/zipstream/organization/2/website"><img src="https://opencollective.com/zipstream/organization/2/avatar.svg"></a>
-<a href="https://opencollective.com/zipstream/organization/3/website"><img src="https://opencollective.com/zipstream/organization/3/avatar.svg"></a>
-<a href="https://opencollective.com/zipstream/organization/4/website"><img src="https://opencollective.com/zipstream/organization/4/avatar.svg"></a>
-<a href="https://opencollective.com/zipstream/organization/5/website"><img src="https://opencollective.com/zipstream/organization/5/avatar.svg"></a>
-<a href="https://opencollective.com/zipstream/organization/6/website"><img src="https://opencollective.com/zipstream/organization/6/avatar.svg"></a>
-<a href="https://opencollective.com/zipstream/organization/7/website"><img src="https://opencollective.com/zipstream/organization/7/avatar.svg"></a>
-<a href="https://opencollective.com/zipstream/organization/8/website"><img src="https://opencollective.com/zipstream/organization/8/avatar.svg"></a>
-<a href="https://opencollective.com/zipstream/organization/9/website"><img src="https://opencollective.com/zipstream/organization/9/avatar.svg"></a>