Drop support for Python 3.6 (#28)

Author: anoadragon453

.github/workflows/ci.yml

@@ -34,7 +34,7 @@ jobs:
       matrix:
         # Run the unit tests both against our oldest supported Python version
         # and the newest stable.
-        python_version: [ "3.6", "3.x" ]
+        python_version: [ "3.7", "3.x" ]
     steps: 
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2

setup.cfg

@@ -14,7 +14,7 @@ classifiers =
 package_dir = =src
 packages =
   matrix_common
-python_requires = >= 3.6
+python_requires = >= 3.7
 install_requires =
   attrs
   importlib_metadata >= 1.4; python_version < '3.8'