Each `generateNotes` plugin will be called in the order defined and will receive the concatenation of the previous one in `nextRelease.notes`.
That gives each plugin the ability to test if there is a notes part that will precede it's own.
Each plugin is expected to return it's own part of the release notes only. **semantic-release** will take care of concatenating all the notes parts.
BREAKING CHANGE: Committing or creating files in the `publish` plugin hook is not supported anymore and now must be done in the `prepare` hook
Plugins with a `publish` hook that makes a commit or create a file that can be committed must use the `prepare` hook.
- Allow `publish` plugins to return an `Object` with information related to the releases
- Add the `success` plugin hook, called when all `publish` are successful, receiving a list of release
- Add the `fail` plugin hook, called when an error happens at any point, receiving a list of errors
- Add detailed message for each error
