No support for batched GraphQL requests

[nathanchapman]

GraphQL requests don't show up in Querio if they contain batched queries/mutations. Queries sent solo (without batching) do appear in Querio.

From https://www.apollographql.com/blog/apollo-client/performance/query-batching/#transport-level-batching

Example Request:

[
  {
    query: <query 0>,
    variables: <variables for query 0>
  },
  {
    query: <query 1>,
    variables: <variables for query 1>
  },
  ...
  {
    query: <query n>,
    variables: <variables for query n>
  }
]

Example Response:

[
  <result for query 0>,
  <result for query 1>,
  ...
  <result for query n>
]

This is most likely the cause of #12 as well