Commits on Dec 10, 2018

1. Add support for error extensions …

   This commit:
    - adds an ErrorExtensions attr to the graphErr type
    - adds an Extensions method to the graphErr type
   
   Why?
    - This adds support for error extensions as described in a
    recent(ish)  update to the [graphql
    spec](https://facebook.github.io/graphql/June2018/#example-fce18).
    The interface changes are minimally invasive, and are in fact
    invisible unless the importing code defines an interface that
    includes the `Extensions()` method.
   
   An example usage:
   
   ```go
   package foo
   
   import "github.com/machinebox/graphql"
   
   ...
   
   type extendedError interface {
   	Extensions() map[string]interface{}
   	Error() string
   }
   
   func bar() {
   ...
   
   	client := graphql.NewClient(...)
     ...
      err := c.client.Run(ctx, req, resp)
      if ok := err.(extendedError); ok {
   		extMsg, _ := json.Marshal(ee.Extensions())
       fmt.Println(extMsg)
       // prints out the extensions, e.g.:
       //{
       //  "message": "Name for character with ID 1002 could not be fetched.",
       //  "locations": [ { "line": 6, "column": 7 } ],
       //  "path": [ "hero", "heroFriends", 1, "name" ],
       //  "code": "CAN_NOT_FETCH_BY_ID",
       //  "timestamp": "Fri Feb 9 14:33:09 UTC 2018"
       //}
      }
   }
   
   ```

   

   blaedj committed Dec 10, 2018
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