Update README.md

Author: KieraKujisawa

README.md

@@ -42,8 +42,6 @@ Updated documentation is currently being worked on
 ## Bug reports and feature requests
 Please use the [issue tracker](https://github.com/IdentityServer/IdentityServer4/issues) for that. 
 
-You can see a list of our current sponsors [here](https://github.com/IdentityServer/IdentityServer4/blob/main/SPONSORS.md) - and for companies we have some nice advertisement options as well.
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 ## Acknowledgements
 IdentityServer4 is built using the following great open source projects and free services: