Merge pull request #3568 from MikeMcQuaid/readme-tweaks

README: tweak contributing, donations sections.

README.md

@@ -26,7 +26,11 @@ We'd love you to contribute to Homebrew. First, please read our [Contribution Gu
 
 We explicitly welcome contributions from people who have never contributed to open-source before: we were all beginners once! We can help build on a partially working pull request with the aim of getting it merged. We are also actively seeking to diversify our contributors and especially welcome contributions from women from all backgrounds and people of colour.
 
-A good starting point for contributing is running `brew audit --strict` with some of the packages you use (e.g. `brew audit --strict wget` if you use `wget`) and then read through the warnings, try to fix them until `brew audit --strict` shows no results and [submit a pull request](https://docs.brew.sh/How-To-Open-a-Homebrew-Pull-Request.html). If no formulae you use have warnings you can run `brew audit --strict` without arguments to have it run on all packages and pick one. Good luck!
+A good starting point for contributing is running `brew audit --strict` with some of the packages you use (e.g. `brew audit --strict wget` if you use `wget`) and then read through the warnings, try to fix them until `brew audit --strict` shows no results and [submit a pull request](https://docs.brew.sh/How-To-Open-a-Homebrew-Pull-Request.html). If no formulae you use have warnings you can run `brew audit --strict` without arguments to have it run on all packages and pick one.
+
+Alternatively, for something more substantial, check out one of the issues labeled `help wanted` in [Homebrew/brew](https://github.com/homebrew/brew/issues?q=is%3Aopen+is%3Aissue+label%3A%22help+wanted%22) or [Homebrew/homebrew-core](https://github.com/homebrew/homebrew-core/issues?q=is%3Aopen+is%3Aissue+label%3A%22help+wanted%22).
+
+Good luck!
 
 ## Security
 Please report security issues to our [HackerOne](https://hackerone.com/homebrew/).
@@ -56,6 +60,18 @@ Please consider a regular donation through Patreon:
 
 [![Donate with Patreon](https://img.shields.io/badge/patreon-donate-green.svg)](https://www.patreon.com/homebrew)
 
+Alternatively, if you'd rather make a one-off payment:
+
+- [Donate with PayPal](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=V6ZE57MJRYC8L)
+- Donate by USA $ check from a USA bank:
+  - Make check payable to "Software Freedom Conservancy, Inc." and place "Directed donation: Homebrew" in the memo field.  Checks should then be mailed to:
+    - Software Freedom Conservancy, Inc.
+      137 Montague ST  STE 380
+      BROOKLYN, NY 11201             USA
+- Donate by wire transfer: contact accounting@sfconservancy.org for wire transfer details.
+
+Homebrew is a member of the [Software Freedom Conservancy](http://sfconservancy.org) which provides us with an ability to receive tax-deductible, Homebrew earmarked donations (and [many other services](http://sfconservancy.org/members/services/)). Software Freedom Conservancy, Inc. is a 501(c)(3) organization incorporated in New York, and donations made to it are fully tax-deductible to the extent permitted by law.
+
 ## Sponsors
 Our Xserve ESXi boxes for CI are hosted by [MacStadium](https://www.macstadium.com).