aiohttp added type annotations, we need to fix as well as work around…

… a few issues

bravado_asyncio/http_client.py

@@ -3,6 +3,7 @@
 from collections import Mapping
 from typing import Any
 from typing import Callable  # noqa: F401
+from typing import cast
 from typing import Dict
 from typing import Optional
 from typing import Union
@@ -140,7 +141,7 @@ def request(
 
         coroutine = self.client_session.request(
             method=request_params.get('method') or 'GET',
-            url=request_params.get('url'),
+            url=cast(str, request_params.get('url', '')),
             params=params,
             data=data,
             headers={

bravado_asyncio/response_adapter.py

@@ -40,7 +40,7 @@ def raw_bytes(self) -> bytes:
 
     @property
     def reason(self) -> str:
-        return self._delegate.reason
+        return self._delegate.reason  # type: ignore  # aiohttp.ClientResponse doesn't annotate this attribute correctly
 
     @property
     def headers(self) -> CIMultiDict:

mypy.ini

@@ -5,5 +5,6 @@ warn_redundant_casts = True
 warn_unused_ignores = True
 
 [mypy-bravado_asyncio.*]
-disallow_untyped_calls = True
+# currently aiohttp has partial type annotations which cause errors if this option is set
+disallow_untyped_calls = False
 disallow_untyped_defs = True