tracing-subscriber 0.3.14

This release fixes multiple filtering bugs in the Layer implementations for
Option<impl Layer> and Vec<impl Layer>.

Fixed

• layer: Layer::event_enabled implementation for Option<impl Layer<S>>
  returning false when the Option is None, disabling all events globally
  (#2193)
• layer: Layer::max_level_hint implementation for Option<impl Layer<S>>
  incorrectly disabling max level filtering when the option is None (#2195)
• layer: Layer::max_level_hint implementation for Vec<impl Layer<S>>
  returning LevelFilter::ERROR rather than LevelFilter::OFF when the Vec
  is empty (#2195)

Thanks to @CAD97 and @guswynn for contributing to this release!