Merge branch 'whitespace_fixers' into 'master'

Add whitespace fixers

See merge request pycqa/flake8!355

.pre-commit-config.yaml

@@ -1,4 +1,10 @@
 repos:
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.3.0
+    hooks:
+    -   id: end-of-file-fixer
+    -   id: trailing-whitespace
+        exclude: ^tests/fixtures/diffs/
 -   repo: https://github.com/pre-commit/mirrors-mypy
     rev: v0.720
     hooks:

codecov.yml

@@ -40,4 +40,3 @@ comment:
   layout: "header, diff, changes, sunburst, uncovered, tree"
   branches: null
   behavior: default
-

docs/source/release-notes/3.7.0.rst

@@ -83,4 +83,3 @@ Features
     https://gitlab.com/pycqa/flake8/merge_requests/287
 .. _GitLab!288:
     https://gitlab.com/pycqa/flake8/merge_requests/288
-