`coho update-release-notes` should also format PR/issue IDs as links

Currently:

```
$ for l in $ACTIVE; do (coho update-release-notes -r $l -g); done
Finding commits in cordova-plugin-splashscreen from tag 5.0.2 to tag master
Done formatting JIRA links for: E:\Projects\Cordova\coho Checkouts 2\cordova-plugin-splashscreen\RELEASENOTES.md
```

This creates something like:

```
* [CB-13826](https://issues.apache.org/jira/browse/CB-13826) Incremented plugin version.
```

But GitHub issues and PR IDs are not touched:

```
* CI: Use universal paramedic travis.yml (#210)
```

It would be nice if those were edited to
```
* CI: Use universal paramedic travis.yml ([#210](https://github.com/apache/cordova-plugin-splashscreen/pull/210))
```

Problem: The repo name is not available as a param, so we would have to probably 1) take it from the folder name, which could also be named "telephone", or 2) parse it from `package.json`.

Start at the coho update-release-notes command and inspect how it currently formats JIRA links in generated RELEASENOTES.md files. Review package.json as the issue suggests for repository identity, then verify that GitHub issue and pull-request IDs become links using the repository URL while existing JIRA formatting still works.

Written by the indexing model from the issue text.