Using skyjs, I want to change the color of the sky. Where should I set it
    let sky = new Sky();
    sky.scale.setScalar(5000);
    this.scene.add(sky);
    let sun = new THREE.Vector3();
    const effectController = {
      turbidity: 20,
      rayleigh: 0.558,
      mieCoefficient: 0.009,
      mieDirectionalG: 0.999998,
      elevation: 15,
      azimuth: -45,
      exposure: this.renderer.toneMappingExposure
    }
    const uniforms = sky.material.uniforms;
    uniforms['turbidity'].value = effectController.turbidity;
    uniforms['rayleigh'].value = effectController.rayleigh;
    uniforms['mieCoefficient'].value = effectController.mieCoefficient;
    uniforms['mieDirectionalG'].value = effectController.mieDirectionalG;
    const phi = THREE.MathUtils.degToRad(90 - effectController.elevation);
    const theta = THREE.MathUtils.degToRad(effectController.azimuth);
    sun.setFromSphericalCoords(1, phi, theta);

