TZID is parsed but never used when reading ICAL strings

[dimerman]

the following test fails

it 'parses' do
  ical = 'DTSTART;TZID=AST:20170801T220500\rRRULE:FREQ=MINUTELY;INTERVAL=5'
  schedule = IceCube::Schedule.from_ical ical
  expect(schedule.start_time.zone).to eq 'AST'
end

IMHO it's because on ical_parser.rb:7 the tzid value is read but never used.

Is anybody handling this already? I see it's been handled on #335 .
Any idea what's the ETA on that?

thanks!