Added nightly to github workflow, as well as a rustfmt step to verify formatting.

.github/workflows/rust.yml

@@ -12,7 +12,15 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
+      - name: Install minimal nightly with clippy and rustfmt
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly
+          components: rustfmt, clippy
       - name: Clippy
         run: cargo clippy --verbose
       - name: Run tests
         run: cargo test --verbose
+      - name: Rust Fmt
+        run: cargo fmt --verbose -- --check