0.22.0

Release notes

• Added an implementation From<Date> for DateRange and DateTimeRange to make it
  simpler to request a single full day's worth of data
• Added conversions between DateRange and DateTimeRange
• Added conversions from timeseries::GetRangeParams, timeseries::GetRangeToFileParams,
  and dbn::Metadata to symbology::ResolveParams
• Upgraded DBN version to 0.31.0:
  • Added support for mapping symbols from instrument definitions to PitSymbolMap
    with a new on_instrument_def() method
  • Added instrument definition compatibility trait InstrumentDefRec for generalizing
    across different versions of the instrument definition record
  • Added Ord and PartialOrd implementations for all enums and FlagSet to allow
    for use in ordered containers like BTreeMap
  • Added decode_records() method to AsyncDbnDecoder and AsyncDbnRecordDecoder
    which is similar to the sync decoder methods of the same name
  • Removed deprecated dataset module. The top-level Dataset enum and its const as_str()
    method provide the same functionality for all datasets
  • Removed deprecated SymbolIndex::get_for_rec_ref() method