Update sponsorship information

Author: michael-grunder

README.markdown

@@ -8,12 +8,16 @@ This code has been developed and maintained by Owlient from November 2009 to Mar
 
 You can send comments, patches, questions [here on github](https://github.com/phpredis/phpredis/issues), to [email protected] ([@yowgi](https://twitter.com/yowgi)), to [email protected] ([@grumi78](https://twitter.com/grumi78)) or to [email protected] ([@yatsukhnenko](https://twitter.com/yatsukhnenko)).
 
-## Donating to the project
-If you've found phpredis useful and would like to buy the maintainers a coffee (or a Tesla, we're not picky), feel free to do so.
+## Supporting the project
+PhpRedis will always be free and open source software, but if you or your company has found it useful please consider supporting the project.  Developing a large, complex, and performant library like PhpRedis takes a great deal of time and effort, and support would be appriciated! :heart:
 
-[![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://www.paypal.me/michaelgrunder/5)
-[![Donate with Bitcoin](https://en.cryptobadges.io/badge/micro/1FXkYHBo5uoaztxFbajiPfbnkgKCbF3ykG)](https://en.cryptobadges.io/donate/1FXkYHBo5uoaztxFbajiPfbnkgKCbF3ykG)
-[![Donate with Ethereum](https://en.cryptobadges.io/badge/micro/0x43D54E32357B96f68dFF0a6B46976d014Bd603E1)](https://en.cryptobadges.io/donate/0x43D54E32357B96f68dFF0a6B46976d014Bd603E1)
+The best way to support the project is through [GitHub sponsors](https://github.com/sponsors/michael-grunder).  Many of the reward tiers grant access to our [slack channel](https://phpredis.slack.com) where [myself](https://github.com/michael-grunder) and [Pavlo](https://github.com/yatsukhnenko) are regularly online and available.  Additionally this will allow you to provide feedback on which fixes and new features to prioritize.
+
+You can also make a one-time contribution with one of the links below.
+
+[![PayPal](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://www.paypal.me/michaelgrunder/5)
+[![Bitcoin](https://en.cryptobadges.io/badge/micro/1FXkYHBo5uoaztxFbajiPfbnkgKCbF3ykG)](https://en.cryptobadges.io/donate/1FXkYHBo5uoaztxFbajiPfbnkgKCbF3ykG)
+[![Ethereum](https://en.cryptobadges.io/badge/micro/0x43D54E32357B96f68dFF0a6B46976d014Bd603E1)](https://en.cryptobadges.io/donate/0x43D54E32357B96f68dFF0a6B46976d014Bd603E1)
 
 
 # Table of contents