Bump pyyaml from 5.4.1 to 6.0

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 5.4.1 to 6.0.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/master/CHANGES)
- [Commits](yaml/pyyaml@5.4.1...6.0)

---
updated-dependencies:
- dependency-name: pyyaml
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

setup.py

@@ -59,7 +59,7 @@
     },
     install_requires=[
         'docopt==0.6.2',
-        'PyYAML==5.4.1',
+        'PyYAML==6.0',
         'mysqlclient==2.0.3',
         'sql_metadata==2.3.0',
         'termcolor==1.1.0',