cache deps

.github/workflows/test.yml

@@ -16,6 +16,18 @@ jobs:
         uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python-version }}
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        id: deps_cache
+        with:
+          path: |
+            ${{ env.pythonLocation }}/lib/*/site-packages/*
+            ${{ env.pythonLocation }}/bin/*
+          key: ${{ runner.os }}-pip-${{ matrix.python-version }}-${{ hashFiles('setup.py', 'requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-${{ matrix.python-version }}-
+            ${{ runner.os }}-pip-
+            ${{ runner.os }}-
       - name: Install dependencies
         run: |
           pip install -U wheel setuptools coveralls