Update version to 8.0.0.

In this release:

Some of the Notice-and-Comment functionality has been split into a separate
Django app. This should significantly reduce the dependencies of down-stream
applications which don't use that feature.

Warning of data loss:

The "FailedCommentSubmission" model has moved from `regulations` to
`notice_comment` without a corresponding data migration. If this data is
important, please export it before running migrations. Alternatively, you may
run only the `notice_comment` migrations, manually transfer the data, then run
the `regulations` migrations.

Upgrade steps:

If your app does not need Notice-and-Comment, no changes are needed.

If your app does include N&C, you will need to:

* Add `regulations[notice_comment]` as a Python requirement (rather than just
  `regulations`)
* Add `notice_comment` to your `INSTALLED_APPS` in the Django settings
* Mount the N&C urls either by directly including `notice_comment.urls` or by
  deferring to `regulations.all_urls`
* Migrate your database. Note the potential for data loss above!

setup.py

@@ -3,7 +3,7 @@
 
 setup(
     name="regulations",
-    version="7.1.0",
+    version="8.0.0",
     packages=find_packages(),
     include_package_data=True,
     install_requires=[