Method update

src/fl/math/filter/filter.h:267–267

    LeakyIntegrator() FL_NOEXCEPT = default;
    explicit LeakyIntegrator(T initial) : mImpl(initial) {}
    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(T initial = T(0)) { mImpl.reset(initial); }
  private: