We can use shorthand style for repository field https://github.com/npm/normalize-package-data/pull/31.
Actually, [your project *gulp-remove-use-strict* uses this style](https://github.com/azu/gulp-remove-use-strict/blob/e22852680b2733ae5a3920d30aeb475f77bfb70f/package.json#L13). 
Another reason why I recommend shorthand style is that [it automatically fills `homepage` field and `bugs` field](https://www.npmjs.org/package/gulp-remove-use-strict) on npm page.