add support for newer node

[Jiajie Han]

once I upgrade node to v10.11, it seems that current version would not work

internal/modules/cjs/loader.js:718
  return process.dlopen(module, path.toNamespacedPath(filename));
                 ^

Error: The module '/usr/local/lib/node_modules/create-dmg/node_modules/macos-alias/build/Release/volume.node'
was compiled against a different Node.js version using
NODE_MODULE_VERSION 59. This version of Node.js requires
NODE_MODULE_VERSION 64. Please try re-compiling or re-installing
the module (for instance, using `npm rebuild` or `npm install`).
    at Object.Module._extensions..node (internal/modules/cjs/loader.js:718:18)
    at Module.load (internal/modules/cjs/loader.js:599:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
    at Function.Module._load (internal/modules/cjs/loader.js:530:3)
    at Module.require (internal/modules/cjs/loader.js:637:17)
    at require (internal/modules/cjs/helpers.js:20:18)
    at Object.<anonymous> (/usr/local/lib/node_modules/create-dmg/node_modules/macos-alias/lib/create.js:7:13)
    at Module._compile (internal/modules/cjs/loader.js:689:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
    at Module.load (internal/modules/cjs/loader.js:599:32)

Downgrade to v9.11.1 can walk around but it is not eligant

[Jiajie Han]

It seems that I have to reinstall create-dmg when I upgrade to newer node