add 3.10

Author: ssolson

.github/workflows/main.yml

@@ -94,7 +94,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ["windows-latest", "ubuntu-latest", "macos-latest"]
-        python-version: [3.8, 3.9]
+        python-version: [3.8, 3.9, 3.10]
     env:
       PYTHON_VER: ${{ matrix.python-version }}
 
@@ -152,7 +152,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ["windows-latest", "ubuntu-latest", "macos-latest"]
-        python-version: [3.8, 3.9]
+        python-version: [3.8, 3.10]
 
     steps:
       - uses: conda-incubator/setup-miniconda@v2