Updates github actions to new syntax (#752)

Author: Panaetius

.github/workflows/test.yml

@@ -14,7 +14,7 @@ jobs:
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v1
       with:
-        version: ${{ matrix.python-version }}
+        python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
@@ -34,7 +34,7 @@ jobs:
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v1
       with:
-        version: ${{ matrix.python-version }}
+        python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
@@ -55,7 +55,7 @@ jobs:
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v1
       with:
-        version: ${{ matrix.python-version }}
+        python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
         brew update