Method update

src/fl/math/filter/filter.h:338–338

        return BiquadFilter(Impl::notch(center_hz, sample_rate, q));
    }
    FASTLED_FORCE_INLINE T update(T input) { return mImpl.update(input); }
    FASTLED_FORCE_INLINE T value() const { return mImpl.value(); }
    FASTLED_FORCE_INLINE void reset() { mImpl.reset(); }
  private: