You can also limit the notifications you receive to specific branches
by appending `?branches=master,development` to the end of the URL,
where `master` and `development` are the branches you'd like to be
notified about.

Add macro for appending branches to webhook URLs.
templates: Add macro for appending branches to webhook URLs.

This macro is an alternative to git-webhook-url-with-branches.md,
which contains the full URL with a `branches` query parameter at
the end. This macro is for when we just want to specify that this
can be done but the URL to append to can be variable or is unique
to a particular integration (and thus, doesn't warrant its own
macro and a full URL example).
