README: use PLC email for corporate donors.

README.md

@@ -27,7 +27,7 @@ Homebrew is a non-profit project run entirely by unpaid volunteers. We need your
 
 Please consider a regular donation through [GitHub Sponsors](https://github.com/sponsors/Homebrew), [Open Collective](https://opencollective.com/homebrew) or [Patreon](https://www.patreon.com/homebrew). Homebrew is fiscally hosted by the [Open Source Collective](https://opencollective.com/opensource).
 
-For questions about donations, including corporate giving, please contact us through our Open Collective [contact form](https://opencollective.com/homebrew/contact).
+For questions about donations, including corporate giving, please email the Homebrew PLC at [[email protected]](mailto:[email protected]).
 
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