Syntax errors in README

[TomiBelan]

1. A comma and a colon are missing near here in the GraphQL example:

      type: new GraphQLList(UserType)
      resolve (user, { first }) => queryLoader.load([

2. The last line of the Redis example }); is missing one closing parenthesis.

3. This indentation is probably a mistake:

      id => rows.find(
        row => row.id === id) || new Error(`Row not found: ${id}`
      )

[leebyron]

Thanks, next time feel free to open a pull request directly (you can do this by going to any file in github and clicking "edit")