Merge pull request #454 from arrowtype/dependabot/pip/aiohttp-3.7.4

Bump aiohttp from 3.6.2 to 3.7.4

Author: arrowtype

requirements.freeze.txt

@@ -1,7 +1,7 @@
 afdko==3.2.0
 aiodns==2.0.0
 aiofiles==0.4.0
-aiohttp==3.6.2
+aiohttp==3.7.4
 appdirs==1.4.3
 astroid==2.3.0
 async-timeout==3.0.1