Add Python 3.11 to CI. (#17)

Author: tobiasraabe

.github/workflows/main.yml

@@ -27,20 +27,21 @@ jobs:
       fail-fast: false
       matrix:
         os: ['ubuntu-latest', 'macos-latest', 'windows-latest']
-        python-version: ['3.7', '3.8', '3.9', '3.10']
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
 
     steps:
       - uses: actions/checkout@v2
       - uses: conda-incubator/setup-miniconda@v2
         with:
-          auto-update-conda: true
+          auto-update-conda: false
           python-version: ${{ matrix.python-version }}
+          channels: conda-forge,nodefaults
+          mamba-version: "*"
 
       - name: Install core dependencies.
         shell: bash -l {0}
         run: conda install -c conda-forge tox-conda coverage mamba
 
-
       # Unit, integration, and end-to-end tests.
 
       - name: Run unit tests and doctests.
@@ -60,8 +61,3 @@ jobs:
         if: runner.os == 'Linux' && matrix.python-version == '3.8'
         shell: bash -l {0}
         run: bash <(curl -s https://codecov.io/bash) -F end_to_end -c
-
-      - name: Validate codecov.yml
-        if: runner.os == 'Linux' && matrix.python-version == '3.8'
-        shell: bash -l {0}
-        run: cat codecov.yml | curl --data-binary @- https://codecov.io/validate