Use per-file-ignores built into the new flake8

.flake8

@@ -46,12 +46,11 @@ ignore =
 min-version = 3.4.0
 max-complexity = 12
 per-file-ignores =
-    /qutebrowser/api/hook.py : N801
-    /tests/**/*.py : D100,D101,D401
-    /tests/unit/browser/test_history.py : N806
-    /tests/helpers/fixtures.py : N806
-    /tests/unit/browser/webkit/http/test_content_disposition.py : D400
-    /scripts/dev/ci/appveyor_install.py : FI53
+    qutebrowser/api/hook.py : N801
+    tests/* : D100,D101
+    tests/unit/browser/test_history.py : D100,D101,N806
+    tests/helpers/fixtures.py : D100,D101,N806
+    tests/unit/browser/webkit/http/test_content_disposition.py : D100,D101,D400
 copyright-check = True
 copyright-regexp = # Copyright [\d-]+ .*
 copyright-min-file-size = 110

misc/requirements/requirements-flake8.txt

@@ -1,6 +1,7 @@
 # This file is automatically generated by scripts/dev/recompile_requirements.py
 
 attrs==18.2.0
+entrypoints==0.3
 flake8==3.7.5
 flake8-bugbear==18.8.0
 flake8-builtins==1.4.1
@@ -11,17 +12,14 @@ flake8-deprecated==1.3
 flake8-docstrings==1.3.0
 flake8-future-import==0.4.5
 flake8-mock==0.3
-flake8-per-file-ignores==0.8.1
 flake8-polyfill==1.0.2
 flake8-string-format==0.2.3
 flake8-tidy-imports==2.0.0
 flake8-tuple==0.2.13
 mccabe==0.6.1
-pathmatch==0.2.1
 pep8-naming==0.8.2
 pycodestyle==2.5.0
 pydocstyle==3.0.0
 pyflakes==2.1.0
 six==1.12.0
 snowballstemmer==1.2.1
-typing==3.6.6

misc/requirements/requirements-flake8.txt-raw

@@ -8,7 +8,6 @@ flake8-deprecated
 flake8-docstrings
 flake8-future-import
 flake8-mock
-flake8-per-file-ignores
 flake8-string-format
 flake8-tidy-imports
 flake8-tuple