Upgrade test dependencies

.appveyor.yml

@@ -44,6 +44,6 @@ environment:
 matrix:
   fast_finish: true
 install:
-  - "%PYTHON%\\python.exe -m pip install tox==3.14.0"
+  - "%PYTHON%\\python.exe -m pip install tox==3.18.1"
 test_script:
   - "%PYTHON%\\python.exe -m tox"

.travis.yml

@@ -3,7 +3,7 @@ sudo: false
 language: python
 cache: pip
 install:
-  - pip install tox==3.14.0
+  - pip install tox==3.18.1
 matrix:
   allow_failures:
     # Django master is allowed to fail.

requirements.lint.txt

@@ -1,10 +1,14 @@
-appdirs==1.4.3
+appdirs==1.4.4
 attrs==19.3.0
-black==19.3b0
-Click==7.0
-entrypoints==0.3
-flake8==3.7.9
+black==19.10b0
+click==7.1.2
+flake8==3.8.3
+importlib-metadata==1.7.0
 mccabe==0.6.1
-pycodestyle==2.5.0
-pyflakes==2.1.1
-toml==0.10.0
+pathspec==0.8.0
+pycodestyle==2.6.0
+pyflakes==2.2.0
+regex==2020.7.14
+toml==0.10.1
+typed-ast==1.4.1
+zipp==3.1.0

requirements.test.txt

@@ -1,5 +1,21 @@
+attrs==19.3.0
 Brotli==1.0.7
-coverage==4.5.4
-pytest-cov==2.8.1
-pytest==4.6.6
-requests==2.22.0
+certifi==2020.6.20
+chardet==3.0.4
+coverage==5.2.1
+idna==2.10
+importlib-metadata==1.7.0
+iniconfig==1.0.0
+more-itertools==8.4.0
+packaging==20.4
+pathlib2==2.3.5
+pluggy==0.13.1
+py==1.9.0
+pyparsing==2.4.7
+pytest==6.0.0
+pytest-cov==2.10.0
+requests==2.24.0
+six==1.15.0
+toml==0.10.1
+urllib3==1.25.10
+zipp==1.2.0