bump v0.17.0

bump v0.16.2

0.16.1

- feat: Make `Metadata.sheets` (and `Reader.sheet_names`) always return names in workbook order
- style: fix warnings in tests

Impl Error and add `dates` feature

* deprecate `failure` and impl `std::error::Error` instead
* add experimental `dates` feature to convert from a `DataType` into a
`chrono::NaiveDate(Time)`

bump v0.15.6

bump v0.15.5

bum v0.15.4

bump 0.15.3

bump 0.15.2

bump 0.15.1