Octotree will try fetching the main and master branches if none is specified for both syntaxes.
Short syntax::owner/:repo. Optionally specify a branch by appending #:branch (e.g.:owner/:repo#:branch).
URL syntax:https://github.com/:owner/:repo. You can specify a branch by appending/tree/:branch (e.g.https://github.com/:owner/:repo/tree/:branch).
