build(deps): bump yarl from 1.5.1 to 1.6.0

Bumps [yarl](https://github.com/aio-libs/yarl) from 1.5.1 to 1.6.0.
- [Release notes](https://github.com/aio-libs/yarl/releases)
- [Changelog](https://github.com/aio-libs/yarl/blob/master/CHANGES.rst)
- [Commits](aio-libs/yarl@v1.5.1...v1.6.0)

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

Author: dependabot[bot]

requirements.txt

@@ -17,5 +17,5 @@ SQLAlchemy==1.3.19
 tweepy==3.9.0
 venusian==3.0.0
 watchdog==0.10.3
-yarl==1.5.1
+yarl==1.6.0
 attrs==20.2.0