fix(success): fix access to the release notes (semantic-release#284)

There was a wrong assumption that release notes would be passed
separately to the plugin. This is not the case and could break
clients using the new addRelease feature.
This commit fixes the access to the release notes of the next release.

feat: add additional release links to the release (semantic-release#282)

A new option `addReleases` has been added.
Setting this option will add links to other releases
to the Github release body.

The option can be one of `false|"top"|"bottom"`.
The default is `false` to be backward compatible.

Closes semantic-release#281

Co-authored-by: Nils Plaschke <plaschke@adobe.com>

fix: skip permission verification exception when Github Apps (semanti…

…c-release#272)

fix: publish a release when env.GITHUB_URL is set to https://github.com…

… (semantic-release#269)

fix(package): update fs-extra to version 9.0.0

fix(package): update @octokit/rest to version 17.0.0

fix(package): update https-proxy-agent to version 5.0.0

fix: address `@octokit/rest` deprecations (semantic-release#249)

fix(package): update globby to version 11.0.0

chore(package): update ava to version 3.1.0