Remove flake8 from requirements.txt

.travis.yml

@@ -6,63 +6,63 @@ jobs:
       dist: xenial
       python: '3.9-dev'
       install:
-        - pip install -r requirements.txt
+        - pip install "flake8>=3.8" -r requirements.txt
       script:
         - flake8 --count
         - python setup.py bdist_wheel sdist
     - name: "Python 3.8"
       dist: xenial
       python: '3.8'
       install:
-        - pip install -r requirements.txt
+        - pip install "flake8>=3.8" -r requirements.txt
       script:
         - flake8 --count
         - python setup.py bdist_wheel sdist
     - name: "Python 3.7"
       dist: xenial
       python: '3.7'
       install:
-        - pip install -r requirements.txt
+        - pip install "flake8>=3.8" -r requirements.txt
       script:
         - flake8 --count
         - python setup.py bdist_wheel sdist
     - name: "Python 3.6"
       dist: xenial
       python: '3.6'
       install:
-        - pip install -r requirements.txt
+        - pip install "flake8>=3.8" -r requirements.txt
       script:
         - flake8 --count
         - python setup.py bdist_wheel sdist
     - name: "Python 3.5"
       dist: xenial
       python: '3.5'
       install:
-        - pip install -r requirements.txt
-        - flake8 --count
+        - pip install "flake8>=3.8" -r requirements.txt
       script:
+        - flake8 --count
         - python setup.py bdist_wheel sdist
     - name: "Python 3.4"
       dist: trusty
       python: '3.4'
       install:
-        - pip install -I -r requirements.txt
+        - pip install -I "flake8<=2.6" -r requirements.txt
       script:
         - flake8 --count --ignore=F401 .
         - python setup.py bdist_wheel sdist
     - name: "Python 3.3"
       dist: trusty
       python: '3.3'
       install:
-        - pip install -I -r requirements.txt
+        - pip install -I "flake8<=2.6" -r requirements.txt
       script:
         - flake8 --count --ignore=F401 .
         - python setup.py bdist_wheel sdist
     - name: "Python 2.7"
       dist: xenial
       python: '2.7'
       install:
-        - pip install -r requirements.txt
+        - pip install "flake8>=3.8" -r requirements.txt
       script:
         - flake8 --count
         - python setup.py bdist_wheel sdist

requirements.txt

@@ -1,11 +1,7 @@
-flake8>=3.8;python_version>="3.5"
 setuptools;python_version>="3.5"
-flake8>=2.6,<3.0;python_version=='3.4'
-flake8>=2.6,<3.0;python_version=='3.3'
 setuptools<=39.2 ;python_version=='3.4'
 setuptools<=39.2 ;python_version=='3.3'
 typing>=3.6,<3.7;python_version=='3.4'
 typing>=3.6,<3.7;python_version=='3.3'
-flake8>=3.8;python_version<'3'
 setuptools<=44.1;python_version<"3"
 typing>=3.7;python_version<"3"