Update expiration date for gpg release signing key to 2028-07-17.

Was due to expire 2023-07-10. Also updated documentation with the
new public key.

Added gpg directions on how to update the signing key to RELEASE.txt.

Author: rouilj

RELEASE.txt

@@ -261,3 +261,47 @@ repository: https://test.pypi.org/legacy/
 username: <your username on test.pypi.org here>
 password: <your password here>
 ========
+
+-------------
+
+==========================
+GPG public key operations.
+==========================
+
+LIST IN KEYRING
+===============
+
+$ gpg --list-keys -a [email protected]
+
+   pub   rsa4096 2018-07-11 [SC] [expires: 2028-07-17]
+         411E354B5D1AF26125D621221F2DD0CB756A76D8
+   uid           [ultimate] Roundup Team (signing key for roundup
+         releases) <[email protected]>
+   sub   rsa4096 2018-07-11 [E] [expires: 2028-07-17]
+
+EXTEND EXPIRATION DATE
+======================
+
+Needs private key and passphrse for private key
+
+$ gpg --edit-key 411E354B5D1AF26125D621221F2DD0CB756A76D8
+
+  > expire
+  [add some number of months/years to it]
+  > key 1
+    [ this chooses the subkey "sub" ]
+  > expire
+  [add some number of months/years to the sub key ]
+  > save
+  [ saves both keys, will need the private key and passphrase ]
+
+EXPORT NEW KEY
+==============
+
+$ gpg --export -a [email protected] >> \
+   tools/roundup.public.pgp.key
+
+then edit roundup.public.pgp.key keeping only the last key stat starts
+with: -----BEGIN PGP PUBLIC KEY BLOCK-----
+
+Commmit new key to mercurial.

tools/roundup.public.pgp.key

@@ -1,18 +1,18 @@
-This is the public PGP/GPG key used to sign roundup distributions.  It
-is used for at least the 1.6.0 release. (Note in this file the @ sign
+This is the public PGP/GPG key used to sign Roundup distributions.  It
+is used starting with the 1.6.0 release. (Note in this file the @ sign
 in emails have been replaced with the word "at".)
 
 Key info: Roundup Team (signing key for roundup releases)
     <roundup-devel at lists.sourceforge.net>
 RSA key ID: 756A76D8
-Expires: 2023-07-10
+Expires: 2028-07-17
 Key fingerprint = 411E 354B 5D1A F261 25D6  2122 1F2D D0CB 756A 76D8
 
 Import the key in this file using:
 
    gpg --import roundup.public.pgp.key
 
-Then you can use it to verify a downloaded roundup release from pypi.
+Then you can use it to verify a downloaded Roundup release from pypi.
 Get the url of the release from:
 
   https://pypi.org/project/roundup
@@ -48,7 +48,6 @@ which verifies the tarball integrity. If something is wrong you will see:
 roundup-devel mailing list if there is a problem.
 
 -----BEGIN PGP PUBLIC KEY BLOCK-----
-Version: GnuPG v1
 
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 -----END PGP PUBLIC KEY BLOCK-----