tracing-subscriber 0.3.17

This release of tracing-subscriber fixes a build error when using env-filter
with recent versions of the regex crate. It also introduces several minor API
improvements.

Fixed

• env-filter: Add "unicode-case" and "unicode-perl" to the regex
  dependency, fixing a build error with recent versions of regex (#2566)
• A number of minor documentation typos and other fixes (#2384, #2378,
  #2368, #2548)

Added

• filter: Add fmt::Display impl for filter::Targets (#2343)
• fmt: Made with_ansi(false) no longer require the "ansi" feature, so that
  ANSI formatting escapes can be disabled without requiring ANSI-specific
  dependencies (#2532)

Changed

• fmt: Dim targets in the Compact formatter, matching the default
  formatter (#2409)

Thanks to @keepsimple1, @andrewhalle, @LeoniePhiline, @LukeMathWalker,
@howardjohn, @daxpedda, and @dbidwell94 for contributing to this release!