Function credit::repo_threads

pub fn repo_threads(
    client: &Client, 
    ipb: &ProgressBar, 
    ppb: &ProgressBar, 
    serial: bool, 
    commits: bool, 
    start: &Option<DateTime<Utc>>, 
    end: &Option<DateTime<Utc>>, 
    owner: &str, 
    repo: &str
) -> Result<Postings>

Given a repository name, look up the Thread statistics of all its Issues.