[Bitbucket] Allow to enable/disable forking of an repo

Until now, there exits no call to change/get the fork settings for an repo.
The status can be get via 
get /rest/api/1.0/projects/{projectKey}/repos/{repositorySlug}
value "forkable"
I think it can set via
post /rest/api/1.0/projects/{projectKey}/repos/{repositorySlug}
and set forkable in the json part.