fix github actions

Author: multicatch

.github/workflows/main.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Install latest rust toolchain
-      - uses: actions-rust-lang/setup-rust-toolchain@v1
+        uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
           toolchain: stable