OAuth2::AccessToken#refresh! returns new object, not itself

It is a common practice that when we use bang! methods methods are performed to object itself.

On line https://github.com/intridea/oauth2/blob/master/lib/oauth2/access_token.rb#L99 #refresh! method returns new token, so we can not use it in such way:

def try_refresh
  # some work
  token.refresh!
  # more work
  token
end

Instead we should use temporary variable, like this:

def try_refresh
  # some work
  new_token = token.refresh!
  # more work
  new_token
end