Bump aiohttp from 3.6.1 to 3.6.2

Bumps [aiohttp](https://github.com/aio-libs/aiohttp) from 3.6.1 to 3.6.2.
- [Release notes](https://github.com/aio-libs/aiohttp/releases)
- [Changelog](https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst)
- [Commits](aio-libs/aiohttp@v3.6.1...v3.6.2)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

requirements-dev.txt

@@ -1,7 +1,7 @@
 aiohttp-jinja2==1.1.2
 aiohttp-security==0.4.0
 aiohttp-session==2.8.0
-aiohttp==3.6.1
+aiohttp==3.6.2
 aiomysql==0.0.20
 aiopg==1.0.0
 coverage==4.5.4