Inspect pull request text

If a commit is semantic, but comes from the pull request, the message that it fixes a particular issue could be in the text of the *pull request*.

For example, pull request https://github.com/bahmutov/snap-shot-core/pull/14 in its text says that it closes issue 13 (`fixes #13`), but because the commit itself does not say this, there is no message in the issue 13 that new version has been published.

The commit message in this case has pull request number https://github.com/bahmutov/snap-shot-core/commit/85ac6922a3cead393abd07bdfb0b9cb30a6a3166

```
fix(store): escape values with jsesc (#14)
```

Should should inspect the commit message, find `#14`, see if this refers to the closed pull request, fetch the text of the pull request, and parse the text just like parsing commit message to find closed issues to comment on