[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

.readthedocs.yml

@@ -19,4 +19,4 @@ build:
     python: "3.9"
   jobs:
     post_create_environment:
-      - pip install .[all]
+      - pip install .[all]

tests/requirements.txt

@@ -1,4 +1,4 @@
-beautifulsoup4>=4.9.1,<4.12.3
+beautifulsoup4<4.12.3,>=4.9.1
 coincidence>=0.2.0
 coverage>=5.1
 coverage-pyver-pragma>=0.2.1