Remove 3.6 support and update Python setup version

Author: oscargus

.github/workflows/reviewdog.yml

@@ -10,9 +10,9 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Set up Python 3
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v3
         with:
-          python-version: 3.8
+          python-version: 3.9
 
       - name: Install flake8
         run: pip3 install flake8

.github/workflows/tests.yml

@@ -16,15 +16,15 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10"]
+        python-version: ["3.7", "3.8", "3.9", "3.10"]
 
     steps:
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v3
         with:
           python-version: ${{ matrix.python-version }}
 

setup.py

@@ -9,11 +9,10 @@
       url='https://github.com/matplotlib/cycler',
       platforms='Cross platform (Linux, macOS, Windows)',
       license="BSD",
-      python_requires='>=3.6',
+      python_requires='>=3.7',
       classifiers=['License :: OSI Approved :: BSD License',
                    'Development Status :: 4 - Beta',
                    'Programming Language :: Python :: 3',
-                   'Programming Language :: Python :: 3.6',
                    'Programming Language :: Python :: 3.7',
                    'Programming Language :: Python :: 3.8',
                    'Programming Language :: Python :: 3.9',