Release 0.0.21

This release includes many improvements.

For an overview of the what's included in this release, please see:
https://github.com/check-spelling/check-spelling/releases/tag/v0.0.21

Note that the workflow has had some significant changes since previous
versions, so you will probably want to refresh it based on:
https://github.com/check-spelling/spell-check-this/blob/a8edeba290dd670ec30d1638cfda2794f32cb5f2/.github/workflows/spelling.yml

Especially splitting the comment-pr / comment-push.

The individual with flags are things you should choose individually.

[`use_magic_file`](https://github.com/check-spelling/check-spelling/wiki/Configuration#use_magic_file)
Is a brand new feature. I'm definitely looking for feedback -- if it
complains about a file and you think it shouldn't, I'd like to know.
So far, it has only complained about one interesting file (it found a
0x7f in a .go file). The project wasn't [attached](facebook/time@6266b73)
to that byte...

[`check_commit_messages`](https://github.com/check-spelling/check-spelling/wiki/Configuration#check_commit_messages)
is something I'm still experimenting with. I don't expect most projects
will want to use it.

[`check_file_names`](https://github.com/check-spelling/check-spelling/wiki/Configuration#check_file_names)
has been available for a bit, but I've only started using it myself
recently. I don't know if projects will want to use it, you should
consider whether it's valuable for your project. I think in general,
the cost to using it shouldn't be particularly burdensome as it'll just
result in a couple of items that your users add to `expect.txt`, and
most of the time the file names or paths should correspond to content
that's already being checked.

[`use_sarif`](https://github.com/check-spelling/check-spelling/wiki/Configuration#use_sarif)
is a brand new feature.  I'm definitely looking for feedback.

GitHub's handling of SARIF content is somewhat quirky. If you have the
resources to complain to GitHub about its handling, that's appreciated.

If you find bugs in the generated sarif, please report them.

Note: this is the second release where I intend to use the ability to report
on the status of a release after it is made.

For more information, see:
https://github.com/check-spelling/check-spelling/wiki/Feature:-Security-Polling

.github/actions/spelling/patterns.txt

@@ -15,6 +15,8 @@ catching 'templatesz'
 ^\s*cspell:.*\.txt$
 # githubusercontent
 /[-a-z0-9]+\.githubusercontent\.com/[-a-zA-Z0-9?&=_\/.]*
+\bgithub\.com/[^/]+/[^/]+/blob/[0-9a-f]+/
+
 # Perl hex escaped regular expression patterns
 \\x\{[0-9A-F]{3,}\}
 

version

@@ -1 +1 @@
-0.0.20
+0.0.21