I have the following problem, to estimate an upper bound of the modulus of
$$\int\limits_C\frac{z+4}{z^3-1},$$
where $C$ is the circumference arc that passes from (2,0) to (0,2i) in the first quadrant, with origing as a center. I know that I have to use the estimation theorem, but I don't know how to bound
$$\frac{z+4}{z^3-1}.$$
Any help will be appreciated.