Call to constructor of base class in operator=

[jonesmz]

https://github.com/Capital-Asterisk/longeronpp/blob/133dec40415b1382b6312fea7e4b22f115efe046/src/longeron/id_management/refcount.hpp#L33

    // Allow move assign only if all counts are zero
    RefCount& operator=(RefCount&& move)
    {
        assert(only_zeros_remaining(0));
        base_t(std::move(move));
        return *this;
    }

Should be

    // Allow move assign only if all counts are zero
    RefCount& operator=(RefCount&& move)
    {
        assert(only_zeros_remaining(0));
        base_t::operator=(std::move(move));
        return *this;
    }

[Capital-Asterisk]

Merged in #2