fix(dependencies): add urllib3 and requests to aiohttp extra (#755)

Fixes #707.
diff --git a/setup.py b/setup.py
index ef723f8..f2fd4e5 100644
--- a/setup.py
+++ b/setup.py
@@ -31,7 +31,11 @@
 )
 
 extras = {
-    "aiohttp": "aiohttp >= 3.6.2, < 4.0.0dev; python_version>='3.6'",
+    "aiohttp": [
+        "aiohttp >= 3.6.2, < 4.0.0dev; python_version>='3.6'",
+        "requests >= 2.18.0, < 3.0.0dev",
+        "urllib3 >= 1.0.0, <2.0.0dev",
+    ],
     "pyopenssl": "pyopenssl>=20.0.0",
     "reauth": "pyu2f>=0.1.5",
 }