Fix git URL in package.json

[RyanZim]

Publishing warns:

npm warn publish npm auto-corrected some errors in your package.json when publishing.  Please run "npm pkg fix" to address these errors.
npm warn publish errors corrected:
npm warn publish "repository.url" was normalized to "git+https://github.com/jprichardson/node-fs-extra.git"

This is the result of running npm pkg fix