ARROW-93 Adopt flake8-rst checks (#221)

* ARROW-93 Adopt flake8-rst checks

* Restrict flake8 hook to .rst files

.pre-commit-config.yaml

@@ -46,6 +46,18 @@ repos:
     additional_dependencies: [sphinx]
     args: ["--ignore-directives=doctest,testsetup,todo,automodule","--ignore-substitutions=release", "--report-level=error"]
 
+- repo: https://github.com/PyCQA/flake8
+  rev: 3.9.2
+  hooks:
+  - id: flake8
+    files: \.rst$
+    additional_dependencies: [
+        'flake8-rst==0.8.0',
+        'flake8-bugbear==20.1.4',
+        'flake8-logging-format==0.6.0',
+        'flake8-implicit-str-concat==0.2.0',
+    ]
+
 # We use the Python version instead of the original version which seems to require Docker
 # https://github.com/koalaman/shellcheck-precommit
 - repo: https://github.com/shellcheck-py/shellcheck-py