Add note about use of trusted publishing; remove Verification section.

README.md

@@ -21,28 +21,13 @@ ABNF is tested with Python 3.9-13.
 
 ## Installation
 
-The abnf package is available from [PyPI](https://pypi.org/project/abnf/).
+The abnf package is available from [PyPI](https://pypi.org/project/abnf/). As of version 2.3.1, abnf uses
+trusted publishing.
 
 Install it in the usual way.
 
     pip install abnf
 
-### Verification
-
-The abnf package is signed with GPG.  The public key is available from [github](https://github.com/declaresub.gpg),
-or [OpenPGP](https://keys.openpgp.org/).  The key fingerprint is `3A27 290F D243 BD83 BC3F  5BC8 86C0 57F9 6A41 A77B`.
-
-
-Once you have imported the public key into GPG, you can check the signature by downloading
-the files and the signature files from [PyPI](https://pypi.org/project/abnf/).  No
-download links for the signature files are present; you need to create them by appending `.asc`
-to the package URLs.  
-
-Once downloaded, use gpg to verify the signatures.
-
-    gpg --verify abnf-1.0.0.tar.gz.asc abnf-1.0.0.tar.gz
-    gpg --verify abnf-1.0.0-py2.py3-none-any.whl.asc abnf-1.0.0-py2.py3-none-any.whl
-
 
 ## Usage