Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -1,7 +1,5 @@
 # Contributing to cargo-guppy
 
-Development for `cargo-guppy` happens in the open on GitHub.
-
 ## Pull Requests
 
 We actively welcome your pull requests. If you have a new feature in mind, please discuss the feature in an issue to
@@ -10,25 +8,17 @@ ensure that your contributions will be accepted.
 1. Fork the repo and create your branch from `main`.
 2. If you've added code that should be tested, add tests.
 3. If you've changed APIs, update the documentation.
-4. Ensure the test suite passes with `cargo test --all-features`.
-5. Run `cargo fmt` to automatically format your changes (CI will let you know if you missed this).
-6. If you haven't already, complete the Contributor License Agreement ("CLA").
-
-## Contributor License Agreement ("CLA")
-
-In order to accept your pull request, we need you to submit a CLA. You only need to do this once to work on any of
-Facebook's open source projects.
-
-Complete your CLA here: <https://code.facebook.com/cla>
+4. Ensure the test suite passes:
+  a. Install [cargo nextest](https://nexte.st/book/pre-built-binaries) if you haven't already.
+  b. Run `cargo nextest run --all-features`.
+  c. Run `cargo test --doc --all-features` to run doctests.
+5. Run `cargo xfmt` to automatically format your changes (CI will let you know if you missed this).
 
 ## Issues
 
 We use GitHub issues to track public bugs. Please ensure your description is clear and has sufficient instructions to be
 able to reproduce the issue.
 
-Facebook has a [bounty program](https://www.facebook.com/whitehat/) for the safe disclosure of security bugs. In those
-cases, please go through the process outlined on that page and do not file a public issue.
-
 ## License
 
 By contributing to `cargo-guppy`, you agree that your contributions will be dual-licensed under the terms of the