Bump aiohttp from 3.6.3 to 3.7.1

Bumps [aiohttp](https://github.com/aio-libs/aiohttp) from 3.6.3 to 3.7.1.
- [Release notes](https://github.com/aio-libs/aiohttp/releases)
- [Changelog](https://github.com/aio-libs/aiohttp/blob/master/CHANGES.rst)
- [Commits](https://github.com/aio-libs/aiohttp/compare/v3.6.3...v3.7.1)

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

requirements.txt

@@ -3,7 +3,7 @@ pandas==1.1.3
 
 ccxt==1.36.66
 multidict==4.7.6
-aiohttp==3.6.3
+aiohttp==3.7.1
 SQLAlchemy==1.3.20
 python-telegram-bot==13.0
 arrow==0.17.0