message: Use v2 of checkout action
diff: @@ -10,7 +10,7 @@ jobs:
  runs-on: ${{ matrix.os }}
  steps:
  - - uses: actions/checkout@v1
  + - uses: actions/checkout@v2
  with:
  # Must fetch at least the immediate parents so that if this is
  # a pull request then we can checkout the head of the pull request.
  