v0.2.16

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===================
This release contains a number of enhancements and bug fixes that have accrued
over the last few months. Most are small polishes. A couple of the bug fixes
apply to panics that could occur when parsing invalid TZ strings or invalid
strptime format strings.

Also, parsing into a Span should now be much faster (for both the ISO 8601
and "friendly" duration formats).

Enhancements:

• #​298:
  Add Serde helpers for (de)serializing std::time::Duration values.
• #​396:
  Add Sub and Add trait implementations for Zoned (in addition to the
  already existing trait implementations for &Zoned).
• #​397:
  Add BrokenDownTime::set_meridiem and ensure it overrides the hour when
  formatting.
• #​409:
  Switch dependency on serde to serde_core. This should help speed up
  compilation times in some cases.
• #​430:
  Add new Zoned::series API, making it consistent with the same API on other
  datetime types.
• #​432:
  When lenient mode is enabled for strftime, Jiff will no longer error when
  the formatting string contains invalid UTF-8.
• #​432:
  Formatting of %y and %g no longer fails based on the specific year value.
• #​432:
  Parsing of %s is now a bit more consistent with other fields. Moreover,
  BrokenDownTime::{to_timestamp,to_zoned} will now prefer timestamps parsed
  with %s over any other fields that have been parsed.
• #​433:
  Allow parsing just a %s into a Zoned via the Etc/Unknown time zone.

Bug fixes:

• #​386:
  Fix a bug where 2087-12-31T23:00:00Z in the Africa/Casablanca time zone
  could not be round-tripped (because its offset was calculated incorrectly as
  a result of not handling "permanent DST" POSIX time zones).
• #​407:
  Fix a panic that occurred when parsing an empty string as a POSIX time zone.
• #​410:
  Fix a panic that could occur when parsing %: via strptime APIs.
• #​414:
  Update some parts of the documentation to indicate that TimeZone::unknown()
  is a fallback for TimeZone::system() (instead of the jiff 0.1 behavior of
  using TimeZone::UTC).
• #​423:
  Fix a panicking bug when reading malformed TZif data.
• #​426:
  Fix a panicking bug when parsing century (%C) via strptime.
• #​445:
  Fixed bugs with parsing durations like -9223372036854775808s
  and -PT9223372036854775808S.

Performance:

• #​445:
  Parsing into Span or SignedDuration is now a fair bit faster in some cases.