Don't specify AccessModifierIndentation configuration twice
Add Twitter::Error::RequestTimeout

This is a new class to catch timeout errors, such that they may be
retried.

It may be used as follows:

begin
  # Make a request using a Twitter::REST::Client
rescue Twitter::Error::RequestTimeout
  retry
end

Prior to this patch, to get the same behavior, you'd need to do this:

begin
  # Make a request using a Twitter::REST::Client
rescue Timeout::Error, Twitter::Error => error
  if error.is_a?(Timeout::Error) || error.cause.is_a?(Timeout::Error) || error.cause.is_a?(Faraday::Error::TimeoutError)
    retry
  else
    raise
  end
end

See https://github.com/sferik/twitter/issues/401.
Increase default timeout values