Replace #495 (#519)

* allow fetching prerelease data

* fix line endings

* use 0th element for test

* only update documentation

* update docs by request. add draft auth detail

* fixed typo

Author: Nyholm

doc/repo/releases.md

@@ -9,6 +9,15 @@ Provides information about releases for a repository. Wraps [GitHub Releases API
 $release = $client->api('repo')->releases()->latest('twbs', 'bootstrap');
 ```
 
+The `latest()` method fetches only releases which are not marked "prerelease" or "draft".
+
+To obtain the latest release *including* prereleases and drafts, select the first element in the "all releases" function:
+```php
+$release = $client->api('repo')->releases()->all('username', 'repo')[0];
+```
+
+Note: Draft releases are only visible to authenticated users who have push access to the repository.
+
 ### List releases for a tag
 
 ```php