Added backers and sponsors on the README

README.md

@@ -7,6 +7,7 @@
 ## (PDF Table Extraction for Humans)
 
 [![Documentation Status](https://readthedocs.org/projects/excalibur-py/badge/?version=master)](https://excalibur-py.readthedocs.io/en/master/) [![image](https://img.shields.io/pypi/v/excalibur-py.svg)](https://pypi.org/project/excalibur-py/) [![image](https://img.shields.io/pypi/l/excalibur-py.svg)](https://pypi.org/project/excalibur-py/) [![image](https://img.shields.io/pypi/pyversions/excalibur-py.svg)](https://pypi.org/project/excalibur-py/) [![Gitter chat](https://badges.gitter.im/camelot-dev/Lobby.png)](https://gitter.im/camelot-dev/Lobby)
+[![Backers on Open Collective](https://opencollective.com/excalibur/backers/badge.svg)](#backers) [![Sponsors on Open Collective](https://opencollective.com/excalibur/sponsors/badge.svg)](#sponsors) 
 
 **Excalibur** is a web interface to extract tabular data from PDFs, written in **Python 3**! It is powered by [Camelot](https://camelot-py.readthedocs.io/).
 
@@ -120,6 +121,36 @@ $ python setup.py test
 
 Excalibur uses [Semantic Versioning](https://semver.org/). For the available versions, see the tags on this repository. For the changelog, you can check out [HISTORY.md](https://github.com/camelot-dev/excalibur/blob/master/HISTORY.md).
 
+## Contributors
+
+This project exists thanks to all the people who contribute. [[Contribute](CONTRIBUTING.md)].
+<a href="https://github.com/camelot-dev/excalibur/graphs/contributors"><img src="https://opencollective.com/excalibur/contributors.svg?width=890&button=false" /></a>
+
+
+## Backers
+
+Thank you to all our backers! 🙏 [[Become a backer](https://opencollective.com/excalibur#backer)]
+
+<a href="https://opencollective.com/excalibur#backers" target="_blank"><img src="https://opencollective.com/excalibur/backers.svg?width=890"></a>
+
+
+## Sponsors
+
+Support this project by becoming a sponsor. Your logo will show up here with a link to your website. [[Become a sponsor](https://opencollective.com/excalibur#sponsor)]
+
+<a href="https://opencollective.com/excalibur/sponsor/0/website" target="_blank"><img src="https://opencollective.com/excalibur/sponsor/0/avatar.svg"></a>
+<a href="https://opencollective.com/excalibur/sponsor/1/website" target="_blank"><img src="https://opencollective.com/excalibur/sponsor/1/avatar.svg"></a>
+<a href="https://opencollective.com/excalibur/sponsor/2/website" target="_blank"><img src="https://opencollective.com/excalibur/sponsor/2/avatar.svg"></a>
+<a href="https://opencollective.com/excalibur/sponsor/3/website" target="_blank"><img src="https://opencollective.com/excalibur/sponsor/3/avatar.svg"></a>
+<a href="https://opencollective.com/excalibur/sponsor/4/website" target="_blank"><img src="https://opencollective.com/excalibur/sponsor/4/avatar.svg"></a>
+<a href="https://opencollective.com/excalibur/sponsor/5/website" target="_blank"><img src="https://opencollective.com/excalibur/sponsor/5/avatar.svg"></a>
+<a href="https://opencollective.com/excalibur/sponsor/6/website" target="_blank"><img src="https://opencollective.com/excalibur/sponsor/6/avatar.svg"></a>
+<a href="https://opencollective.com/excalibur/sponsor/7/website" target="_blank"><img src="https://opencollective.com/excalibur/sponsor/7/avatar.svg"></a>
+<a href="https://opencollective.com/excalibur/sponsor/8/website" target="_blank"><img src="https://opencollective.com/excalibur/sponsor/8/avatar.svg"></a>
+<a href="https://opencollective.com/excalibur/sponsor/9/website" target="_blank"><img src="https://opencollective.com/excalibur/sponsor/9/avatar.svg"></a>
+
+
+
 ## License
 
 This project is licensed under the MIT License, see the [LICENSE](https://github.com/camelot-dev/excalibur/blob/master/LICENSE) file for details.