Scheduled weekly dependency update for week 12 (#592)

* Update msgpack from 1.0.2 to 1.0.3

* Update aiohttp from 3.7.4 to 3.8.1

Author: pyup-bot

requirements/requirements.txt

@@ -4,7 +4,7 @@ requests>2,<3
 urllib3>1.24,<2
 websocket-client>=0.56.0,<2
 websockets>=9.0,<11
-msgpack==1.0.2
-aiohttp==3.7.4
+msgpack==1.0.3
+aiohttp==3.8.1
 PyYAML==6.0
 deprecation==2.1.0