update actions

.github/workflows/test.yml

@@ -16,11 +16,13 @@ jobs:
       uses: actions/setup-python@v1
       with:
         python-version: ${{ matrix.python-version }}
-    - name: Install dependencies
+    - name: Install test dependencies
+      run: |
+        pip install -U pip black==19.10b0
+    - name: Build
       run: |
         python setup.py build_ext --force
         python setup.py develop
     - name: Lint with black
       run: |
-        pip install black==19.10b0
-        black --check **/*.py
+        black --check .