Update release job to fix 6.0.0 release

.github/workflows/release.yml

@@ -10,6 +10,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v1
+      with:
+        submodules: true
 
     - name: Build release binary
       run: cargo build --verbose --locked --release
@@ -25,6 +27,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v1
+      with:
+        submodules: true
 
     - name: Install Rust
       run: curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
@@ -47,6 +51,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v1
+      with:
+        submodules: true
 
     - name: Build
       run: cargo build --locked --verbose --release