Update Example in README (#109)

mattludwigs · Josh Price · commit 50755c5b7f52 · 2016-12-21T10:49:55.000+11:00
diff --git a/README.md b/README.md
@@ -73,7 +73,7 @@ Execute a simple GraphQL query
 
 ```elixir
 iex> GraphQL.execute(TestSchema.schema, "{greeting}")
-{:ok, %{greeting: "Hello, world!"}}
+{:ok, %{data: %{"greeting" => "Hello, world!"}}}
 ```
 
 ## Status
