Bump aiohttp from 3.5.4 to 3.6.0

Bumps [aiohttp](https://github.com/aio-libs/aiohttp) from 3.5.4 to 3.6.0.
- [Release notes](https://github.com/aio-libs/aiohttp/releases)
- [Changelog](https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst)
- [Commits](aio-libs/aiohttp@v3.5.4...v3.6.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

requirements-dev.txt

@@ -1,7 +1,7 @@
 aiohttp-jinja2==1.1.2
 aiohttp-security==0.4.0
 aiohttp-session==2.7.0
-aiohttp==3.5.4
+aiohttp==3.6.0
 aiomysql==0.0.20
 aiopg==0.16.0
 coverage==4.5.4