Update PEP 512 to denote that the initial GH work is done

pep-0512.txt

@@ -172,12 +172,19 @@ tracking who has signed the PSF CLA will be continued by marking that
 fact as part of someone's bugs.python.org user profile. What this
 means is that an association will be needed between a person's
 bugs.python.org [#b.p.o]_ account and their GitHub account, which
-will be done through a new field in a user's profile.
-
-This does implicitly require that contributors will need both a
+will be done through a new field in a user's profile. This does
+implicitly require that contributors will need both a
 GitHub [#github]_ and bugs.python.org account in order to sign the
 CLA and contribute through GitHub.
 
+An API is provided to query bugs.python.org to see if a GitHub
+username corresponds to someone who has signed the CLA. Making a GET
+request to e.g.
+http://bugs.python.org/user?@template=clacheck&github_names=brettcannon,notanuser
+returns a JSON dictionary with the keys of the usernames requested
+and a ``true`` value if they have sigend the CLA, ``false`` if they
+have not, and ``null`` if no corresponding GitHub username was found.
+
 A bot to enforce CLA signing
 ++++++++++++++++++++++++++++
 With an association between someone's GitHub account and their
@@ -187,20 +194,22 @@ GitHub and denote whether the contributor has signed the CLA.
 
 If the user has signed the CLA, the bot will add a positive label to
 the issue to denote the pull request has no CLA issues (e.g., a green
-label stating, "CLA: ✓"). If the contributor has not signed a CLA,
+label stating, "CLA signed"). If the contributor has not signed a CLA,
 a negative label will be added to the pull request will be blocked
-using GitHub's status API (e.g., a red label stating, "CLA: ✗"). If a
-contributor lacks a bugs.python.org account, that will lead to
-another label (e.g., "CLA: ✗ (no account)"). Using a label for both
+using GitHub's status API (e.g., a red label stating, "CLA not signed").
+If a contributor lacks a bugs.python.org account, that will lead to
+the negative label being used as well. Using a label for both
 positive and negative cases provides a fallback notification if the
 bot happens to fail, preventing potential false-positives or
 false-negatives. It also allows for an easy way to trigger the bot
-again by simply removing a CLA-related label.
+again by simply removing a CLA-related label (this is in contrast to
+using a GitHub status check [#gh-status-check]_ which is only
+triggered on code changes).
 
-If no pre-existing, maintained bot exists that fits our needs, one
-will be written from scratch. It will be hosted on Heroku [#heroku]_
-and written to target Python 3.5 to act as a showcase for
-asynchronous programming.
+As no pre-existing bot exists to meet our needs, it will be hosted on
+Heroku [#heroku]_ and written to target Python 3.5 to act as a
+showcase for asynchronous programming. The code for the  bot is hosted
+in the Knights Who Say Ni project [#ni]_.
 
 Requirements for Web-Related Repositories
 -----------------------------------------
@@ -526,22 +535,17 @@ benchmarks [#benchmarks-repo]_ repositories:
 
   - `Create a 'python-dev' team`_
 
-
 * In progress
 
   - `A bot to enforce CLA signing`_:
     https://github.com/python/the-knights-who-say-ni (Brett Cannon)
   - `Define commands to move a Mercurial repository to Git`_:
     https://github.com/orsenthil/cpython-hg-to-git (Senthil Kumaran)
-  - `Adding GitHub username support to bugs.python.org`_ (HTTP API):
-    http://psf.upfronthosting.co.za/roundup/meta/issue581
-    (Maciej Szulik and Ezio Melotti)
 
 * Completed
 
-  - `Adding GitHub username support to bugs.python.org`_:
-    GitHub usernames on bugs.python.org
-      (Maciej Szulik and Ezio Melotti)
+  - `Adding GitHub username support to bugs.python.org`_
+    (Maciej Szulik and Ezio Melotti)
 
 
 Repositories whose build steps need updating:
@@ -882,6 +886,12 @@ References
 
 .. [#heroku] Heroku (https://www.heroku.com/)
 
+.. [#gh-status-check] GitHub status checks
+   (https://developer.github.com/v3/repos/statuses/)
+
+.. [#ni] The Knights Who Say Ni project
+   (https://github.com/python/the-knights-who-say-ni)
+
 Copyright
 =========