Update dependency pydocstyle to v6.3.0 (#16)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

requirements-style.txt

@@ -1,6 +1,6 @@
 pip
 flake8>=3.7.5
-pydocstyle==6.1.1
+pydocstyle==6.3.0
 flake8-bandit>=1.0.1
 flake8-bugbear>=17.12.0
 flake8-comprehensions>=1.4.1