Move thread parser dispatching into _client.py

I know, it's not pretty, but it doesn't belong in _graphql.py either

fbchat/_client.py

@@ -1158,9 +1158,18 @@ class Client(object):
             )
         )
 
-        return [
-            graphql_to_thread(node) for node in j["viewer"]["message_threads"]["nodes"]
-        ]
+        rtn = []
+        for node in j["viewer"]["message_threads"]["nodes"]:
+            _type = node.get("thread_type")
+            if _type == "GROUP":
+                rtn.append(Group._from_graphql(node))
+            elif _type == "ONE_TO_ONE":
+                rtn.append(User._from_thread_fetch(node))
+            else:
+                raise FBchatException(
+                    "Unknown thread type: {}, with data: {}".format(_type, node)
+                )
+        return rtn
 
     def fetchUnread(self):
         """

fbchat/_graphql.py

@@ -82,19 +82,6 @@ def graphql_to_message(message):
     return rtn
 
 
-def graphql_to_thread(thread):
-    if thread["thread_type"] == "GROUP":
-        return Group._from_graphql(thread)
-    elif thread["thread_type"] == "ONE_TO_ONE":
-        return User._from_thread_fetch(thread)
-    else:
-        raise FBchatException(
-            "Unknown thread type: {}, with data: {}".format(
-                thread.get("thread_type"), thread
-            )
-        )
-
-
 def graphql_queries_to_json(*queries):
     """
     Queries should be a list of GraphQL objects

fbchat/graphql.py

@@ -9,7 +9,6 @@ from ._graphql import (
     WHITESPACE,
     ConcatJSONDecoder,
     graphql_to_message,
-    graphql_to_thread,
     graphql_queries_to_json,
     graphql_response_to_json,
     GraphQL,