use +nightly (#2)

* use +nightly

.github/workflows/rust.yml

@@ -16,7 +16,25 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Build
-      run: cargo build --verbose
-    - name: Run tests
-      run: cargo test --verbose
+    - name: Install latest nightly
+      uses: actions-rs/toolchain@v1
+      with:
+          toolchain: nightly
+          override: true
+          components: rustfmt, clippy
+
+    # `cargo check` command here will use installed `nightly`
+    # as it is set as an "override" for current directory
+
+    - name: Run cargo check
+      uses: actions-rs/cargo@v1
+      with:
+        command: check
+    - name: Run cargo Build
+      uses: actions-rs/cargo@v1
+      with:
+        command: build
+    - name: Run cargo test
+      uses: actions-rs/cargo@v1
+      with:
+        command: test