Fix ci (#2)

* rename env file

* remove old metpy file

* flake8

* update black command

Author: dcherian

.github/workflows/linting.yaml

@@ -25,7 +25,7 @@ jobs:
           python -m pip install black
       - name: Black Code Formatter
         run: |
-          black --check --line-length 100 --skip-string-normalization .
+          black --check .
 
   lint-flake8:
     name: flake8

cf_xarray/__init__.py

@@ -1 +1 @@
-from .accessor import CFAccessor
+from .accessor import CFAccessor  # noqa