Add Honeybadger.wrap usage to README.
Add Honeybadger.wrap usage to README.

honeybadger-io/honeybadger-js,honeybadger-io/honeybadger-js,honeybadger-io/honeybadger-js,honeybadger-io/honeybadger-js,honeybadger-io/honeybadger-js,honeybadger-io/honeybadger-js