message: Fix 'fmt' GitHub Actions workflow
diff: @@ -22,7 +22,8 @@ jobs:
  runs-on: ubuntu-latest
  steps:
  - uses: actions/checkout@v2
  -
  + - name: Install nightly Rust
  + run: rustup toolchain install nightly
  - name: Run cargo fmt
  run: cargo fmt --all -- --check
  