v0.4.16

• Add %Z specifier to the FromStr, similar to the glibc strptime (does not set the offset from the timezone name)

• Drop the dependency on time v0.1, which is deprecated, unless the oldtime feature is active. This feature is active by default in v0.4.16 for backwards compatibility, but will likely be removed in v0.5. Code that imports time::Duration should be switched to import chrono::Duration instead to avoid breakage.