title: How to input an array into a GraphQL Mutation
body: <p>I'm trying to add a field to my Mutation that has an array in it with my own type. When I added the attraction the the <code>createTour</code> mutation, I started getting this error:  </p>
  
  <p><strong>Error: The type of Mutation.createTour(attractions:) must be Input Type but got: [Attraction].</strong></p>
  
  <p>Here is the problematic Mutation</p>
  
  <pre><code>type Mutation {
      createTour(
      title: String!
      description: String!
      attractions: [Attraction]      &lt;----- THIS LINE
      ): Tour
      addCommentToTour(id: ID!, comment: String!): Tour
  }
  </code></pre>
  
  <p>And here are the typedefs I have as well. </p>
  
  <pre><code>type Attraction {
      title: String
      description: String
      coordinateLat: Int
      coordinateLong: Int
  }
  
  type Tour {
      id: ID!
      title: String!
      description: String!
      author: String!
      attractions: [Attraction]      
  }
  </code></pre>
  
  <p>How can I get this Mutation to take in this array? </p>