Revert "Drop 3.10 testing until scikit learn is updated"

This reverts commit 686a567.

Author: eddiebergman

.github/workflows/pytest.yml

@@ -46,7 +46,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [windows-latest, macos-latest, ubuntu-latest]
-        python-version: ['3.7', '3.8', '3.9']  # 3.10 once updated
+        python-version: ['3.7', '3.8', '3.9', '3.10']
         kind: ['conda', 'source', 'dist']
 
         exclude:

setup.py

@@ -1,3 +1,4 @@
+# -*- encoding: utf-8 -*-
 import os
 import sys