fix(pythonpackage.yml): use bash

Specify `shell` as `bash` in `Run tests and linters` step.

Fixes: Issue #604

Author: adam-grant-hendry

.github/workflows/pythonpackage.yml

@@ -10,28 +10,29 @@ jobs:
         platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps:
-    - uses: actions/checkout@v2
-      with:
-        fetch-depth: 0
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
-      with:
-        python-version: ${{ matrix.python-version }}
-    - name: Install dependencies
-      run: |
-        python -m pip install -U pip poetry
-        poetry --version
-        poetry install
-    - name: Run tests and linters
-      run: |
-        git config --global user.email "action@github.com"
-        git config --global user.name "GitHub Action"
-        ./scripts/test
-    - name: Upload coverage to Codecov
-      if: runner.os == 'Linux'
-      uses: codecov/codecov-action@v1.0.3
-      with:
-        token: ${{secrets.CODECOV_TOKEN}}
-        file: ./coverage.xml
-        flags: unittests
-        name: codecov-umbrella
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m pip install -U pip poetry
+          poetry --version
+          poetry install
+      - name: Run tests and linters
+        run: |
+          git config --global user.email "action@github.com"
+          git config --global user.name "GitHub Action"
+          ./scripts/test
+        shell: bash
+      - name: Upload coverage to Codecov
+        if: runner.os == 'Linux'
+        uses: codecov/codecov-action@v1.0.3
+        with:
+          token: ${{secrets.CODECOV_TOKEN}}
+          file: ./coverage.xml
+          flags: unittests
+          name: codecov-umbrella