Update supported python versions (#620)

* Update mypy python version

* Update conda python version

Author: altheaden

conda/meta.yaml

@@ -18,10 +18,10 @@ build:
 
 requirements:
   host:
-    - python >=3.6
+    - python >=3.9
     - pip
   run:
-    - python >=3.6
+    - python >=3.9
     - configobj >=5.0.0,<6.0.0
     - jinja2 >=2.0.0
     - mache >=1.3.2

setup.cfg

@@ -46,7 +46,7 @@ exclude =
     venv
 
 [mypy]
-python_version = 3.7
+python_version = 3.9
 check_untyped_defs = True
 ignore_missing_imports = True
 warn_unused_ignores = True