Add support for Python 3.10 (#346)

Update PyPI metadata, add CI runs for 3.10, and use it for the dev environment

Author: leouieda

.github/workflows/pypi.yml

@@ -47,7 +47,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v2
         with:
-          python-version: "3.9"
+          python-version: "3.10"
 
       - name: Install requirements
         run: python -m pip install -r env/requirements-build.txt

.github/workflows/test.yml

@@ -43,11 +43,10 @@ jobs:
           - windows
         python:
           - "3.6"
-          - "3.9"
+          - "3.10"
         dependencies:
           - latest
           - optional
-
     env:
       REQUIREMENTS: env/requirements-build.txt env/requirements-test.txt
       # Used to tag codecov submissions

environment.yml

@@ -3,7 +3,7 @@ channels:
     - conda-forge
     - defaults
 dependencies:
-    - python==3.9
+    - python==3.10
     - pip
     # Build
     - setuptools_scm>=6.2

setup.cfg

@@ -27,6 +27,7 @@ classifiers =
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
 url = https://github.com/fatiando/verde
 project_urls =
     Documentation = https://www.fatiando.org/verde