Drop support for python 3.6 (#101)

Author: ssbarnea

.github/workflows/tox.yml

@@ -28,9 +28,6 @@ jobs:
             python: "3.10"
             tox_env: "packaging"
 
-          - name: py36
-            python: "3.6"
-            tox_env: py36
           - name: py37
             python: "3.7"
             tox_env: py37

setup.cfg

@@ -29,7 +29,6 @@ classifiers =
     Operating System :: POSIX :: Linux
     Programming Language :: Python
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
@@ -53,7 +52,7 @@ extend_ignore = E203
 
 [options]
 use_scm_version = True
-python_requires = >=3.6
+python_requires = >=3.7
 package_dir =
   = src
 packages = find: