Version 0.24.0

- refactor (breaking): rename `DataType` enum to `Data` and `DataTypeRef` to `DataRef`
- feat: introduce a `DataType` trait implemented by both `Data` and `DataRef`.
- feat: `Data` and `DataType` now return `Some(0{.0})` and `Some(1{.0})` rather than `None` when `.as_i64` or `.as_f64`
  is used on a Bool value
- fix: getting tables names on xlsx workbook without _rels files
- refactor: DateTime(f64) to DateTime(ExcelDateTime)
- feat: detect xlsb/ods password protected files
- feat: introduce is_x methods for date and time variants

bump v0.23.1

v0.23.0

- feat: add new `DataTypeRef` available from `worksheet_range_ref` to reduce memory usage
- docs: add benchmark plot
- fix: truncated text in xls
- feat: detect if workbook is password protected

v0.22.1

- fix: regression on `Range::get`
- chore: update GitHub actions
- fix: spelling of formula error type
- feat: support label cells for xls
- refactor: clippy
- perf: preallocate several buffers

Bump version v0.22.0

- docs: improve `de_opt_f64` example.
- docs: remove datetime notice from README
- feat: add support of sheet type and visibility
- style: clippy
- chore: bump MSRV to 1.63 (breaking)
- chore: set edition to 2021
- feat: implement blank string handling

bump 0.21.2

remove appveyor ci

bump v0.21.0

slightly improve builtin_date_format fn

bump v0.19.1