--registry should have higher priority over publishConfig.registry

[Fer0x]

Summary

Flag --registry should have higher priority over publishConfig.registry like --access has higher priority over publishConfig.access. This makes usage of publish more explicit.

Test plan

// package.json
"publishConfig": {
  "registry": "https://my.registry/"
}

yarn test --registry http://my.another.registry/

[Fer0x]

@arcanis please include it in next version.

[Fer0x]

@arcanis any chance to merge it?