jiff-static breaking changes

• unknown \u2192 0.2.0breaking

  [#28](https://github.com/BurntSushi/jiff/issues/28): The deprecated `intz` routines on `Zoned`, `Timestamp`, `civil::DateTime` and `civil::Date` have been removed. You can use `in_tz` instead. This change was made because many found the name `intz` to be unclear.

• unknown \u2192 0.2.0breaking

  [#32](https://github.com/BurntSushi/jiff/issues/32): The `PartialEq` and `Eq` trait implementations on `Span` have been removed. Ideally these shouldn't have been used, but if you do need them, please use `Span::fieldwise` to create a `SpanFieldwise`, which does have the `PartialEq` and `Eq` traits implemented. These were removed on `Span` itself because they made it very easy to commit subtle bugs.

• unknown \u2192 0.2.0breaking

  [#36](https://github.com/BurntSushi/jiff/issues/36): Turn panics during `Timestamp::saturing_add` into errors. Callers adding spans that are known to contain units of hours or smaller are guaranteed that this will not return an error.

• unknown \u2192 0.2.0breaking

  **RUNTIME** [#48](https://github.com/BurntSushi/jiff/issues/48): On `Span` APIs, days are no longer silently assumed to always be 24 hours when a relative datetime is not provided. Instead, to perform operations on units of days or bigger, callers must either provide a relative date or opt into invariant 24-hour days with `SpanRelativeTo::days_are_24_hours`. Shortcuts have been added to the span builders. For example, `SpanTotal::days_are_24_hours`.

• unknown \u2192 0.2.0breaking

  **RUNTIME** [#147](https://github.com/BurntSushi/jiff/issues/147): Change the behavior of the deprecated `%V` conversion specifier in `jiff::fmt::strtime` from formatting an IANA time zone identifier to formatting an ISO 8601 week number. To format an IANA time zone identifier, use `%Q` or `%:Q` (which were introduced in `jiff 0.1`).

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