message: Drop deprecation warnings again
  Deprecating the delayed_anon_send functions will emit warnings inside
  class-based actors. It's actually better to simply drop the legacy
  functions outright in 0.18.
diff: @@ -154,15 +154,13 @@ public:
  template <message_priority P = message_priority::normal, class Dest = actor,
  class Rep = int, class Period = std::ratio<1>, class... Ts>
  void delayed_anon_send(const Dest& dest,
  - std::chrono::duration<Rep, Period> rtime, Ts&&... xs)
  - CAF_DEPRECATED_MSG("use the free function instead") {
  + std::chrono::duration<Rep, Period> rtime, Ts&&... xs) {
  caf::delayed_anon_send<P>(dest, rtime, std::forward<Ts>(xs)...);
  }
  template <class Rep = int, class Period = std::ratio<1>, class... Ts>
  void delayed_anon_send(const group& dest,
  - std::chrono::duration<Rep, Period> rtime, Ts&&... xs)
  - CAF_DEPRECATED_MSG("use the free function instead") {
  + std::chrono::duration<Rep, Period> rtime, Ts&&... xs) {
  caf::delayed_anon_send(dest, rtime, std::forward<Ts>(xs)...);
  }
  @@ -189,4 +187,3 @@ private:
  } // namespace mixin
  } // namespace caf
  -
  