Update flake8 dependencies

Author: mdmintz

requirements.txt

@@ -91,7 +91,7 @@ pdfminer.six==20201018;python_version>="3.5"
 coverage==5.5
 pytest-cov==2.11.1
 flake8==3.7.9;python_version<"3.5"
-flake8==3.9.0;python_version>="3.5"
+flake8==3.9.1;python_version>="3.5"
 pyflakes==2.1.1;python_version<"3.5"
 pyflakes==2.3.1;python_version>="3.5"
 pycodestyle==2.5.0;python_version<"3.5"

setup.py

@@ -37,7 +37,7 @@
         '>>> Confirm release PUBLISH to PyPI? (yes/no): ')).lower().strip()
     if reply == 'yes':
         print("\n*** Checking code health with flake8:\n")
-        os.system("python -m pip install 'flake8==3.9.0'")
+        os.system("python -m pip install 'flake8==3.9.1'")
         flake8_status = os.system("flake8 --exclude=temp")
         if flake8_status != 0:
             print("\nWARNING! Fix flake8 issues before publishing to PyPI!\n")
@@ -200,7 +200,7 @@
         # pip install -e .[flake]
         'flake': [
             'flake8==3.7.9;python_version<"3.5"',
-            'flake8==3.9.0;python_version>="3.5"',
+            'flake8==3.9.1;python_version>="3.5"',
             'pyflakes==2.1.1;python_version<"3.5"',
             'pyflakes==2.3.1;python_version>="3.5"',
             'pycodestyle==2.5.0;python_version<"3.5"',