Merge pull request #569 from stac-utils/dependabot/pip/doc8-0.9.0

chore(deps): Bump doc8 from 0.8.1 to 0.9.0

Author: Jon Duckworth

requirements-test.txt

@@ -6,7 +6,7 @@ codespell==2.1.0
 
 jsonschema==3.2.0
 coverage==5.5
-doc8==0.8.1
+doc8==0.9.0
 
 types-python-dateutil==0.1.4
 types-orjson==0.1.1