Fix README (#5530)
Fix README (#5530)

`count` and `type` should be siblings of `schema`.

Refs:
- https://github.com/gatsbyjs/gatsby/blob/master/examples/using-faker/gatsby-config.js
- https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-source-faker/src/gatsby-node.js#L6
gatsbyjs/gatsby,ChristopherBiscardi/gatsby,0x80/gatsby,fk/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,mingaldrichgan/gatsby,gatsbyjs/gatsby,fk/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,mingaldrichgan/gatsby,0x80/gatsby,0x80/gatsby,ChristopherBiscardi/gatsby,ChristopherBiscardi/gatsby,fk/gatsby,mingaldrichgan/gatsby