title: LIbGit2Sharp: list all the pull request's authors
body: <p>Using the LibGit2Sharp library, I'm trying to list all authors of pull requests on the master branch of a repo. I don't see anything in the docs, intellisense, or through search that has an example of this. Any pointers?? 
  I have constructed the code below, but I'm getting the following error message <code>An unhandled exception of type 'LibGit2Sharp.RepositoryNotFoundException' occurred in LibGit2Sharp.dll</code>.  Browsing around, it seems that the references I find are to local cloned repos and not remote repositories.</p>
  
  <pre><code>static void Main(string[] args)
      {
  
          var co = new CloneOptions();
          co.CredentialsProvider = (_url, _user, _cred) =&gt; new UsernamePasswordCredentials
          {
              Username = "username",
              Password = "password"
          };
  
          var clonedRepoPath = Repository.Clone(url, "path/to/clone", co);
  
          using (var repo = new Repository(clonedRepoPath))
          {
              foreach (Commit commit in repo.Commits)
              {
  
                  Console.WriteLine(commit.Author.Name);
  
              }
              Console.WriteLine("Press any key to continue...");
              Console.ReadLine();
          }        
  
  
  
      }
  }
  </code></pre>
  
  <p>}</p>