@longtimeago but if we have only one constuctor how can we get single release? I created two constructors only for this purpose as each case uses different url. Please see the corresponding links below:

http://developer.github.com/v3/repos/releases/#list-assets-for-a-release
List assets for a release
GET /repos/:owner/:repo/releases/:id/assets

http://developer.github.com/v3/repos/releases/#get-a-single-release-asset
Get a single release asset
GET /repos/:owner/:repo/releases/assets/:id