ci: use nightly toolchain

Author: poly000

.github/workflows/release.yml

@@ -35,7 +35,7 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           target: ${{ matrix.target }}
-          toolchain: stable
+          toolchain: nightly
           override: true
 
       - name: Checkout code
@@ -47,7 +47,7 @@ jobs:
       - name: Run code build
         uses: actions-rs/cargo@v1
         with:
-          toolchain: stable
+          toolchain: nightly
           command: build
           args: --release --target ${{ matrix.target }}