Add 3.10 Dev Tests (#183)

- Lets see and try make us pass 3.10-dev releases

Author: cooperlees

Diff for: .github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10-dev"]
         os: [ubuntu-latest]
 
     steps:
@@ -34,4 +34,4 @@ jobs:
 
     - name: Check formatting
       run: |
-        black --check .
+        black --check .