message: Restore testing of default features
  This includes rendering the reference files, a task that usually
  requires both the dedicate feature of the format as well as the `png`
  feature for the reference images.
diff: @@ -28,6 +28,30 @@ jobs:
  if: ${{ matrix.rust != '1.34.2' }}
  env:
  FEATURES: ${{ matrix.features }}
  + test_defaults:
  + runs-on: ubuntu-latest
  + steps:
  + - uses: actions/checkout@v2
  + - uses: actions-rs/toolchain@v1
  + with:
  + toolchain: stable
  + override: true
  + - name: build
  + run: cargo build -v --release
  + - name: test
  + run: cargo test -v --release
  + test_avif:
  + runs-on: ubuntu-20.04
  + steps:
  + - name: install-dependencies
  + run: sudo apt update && sudo apt install nasm libdav1d-dev
  + - uses: actions/checkout@v2
  + - uses: actions-rs/toolchain@v1
  + with:
  + toolchain: stable
  + override: true
  + - name: build
  + run: cargo build -v --no-default-features --features="avif"
  clippy:
  runs-on: ubuntu-latest
  steps:
  