make xarray a requirement (#100)

Author: mathause

ci/requirements/environment.yml

@@ -5,7 +5,13 @@ channels:
 dependencies:
   - cartopy
   - matplotlib-base
+  - numpy
+  - seaborn
   - xarray
+# formatting
+  - black
+  - isort
+  - flake8
 # for testing
   - pytest
   - pytest-cov

requirements.txt

@@ -5,3 +5,4 @@
 cartopy >= 0.21
 matplotlib >= 3.6
 numpy >= 1.22
+xarray >= 2022.12

setup.cfg

@@ -25,9 +25,10 @@ zip_safe = False  # https://mypy.readthedocs.io/en/latest/installed_packages.htm
 include_package_data = True
 python_requires = >=3.9
 install_requires =
-    cartopy >= 0.21
-    matplotlib >= 3.6
-    numpy >= 1.22
+    cartopy >=0.21
+    matplotlib >=3.6
+    numpy >=1.22
+    xarray >=2022.12
 
 [tool:pytest]
 filterwarnings =