add Wasm build to CI (#134)

.github/workflows/rust.yml

@@ -17,8 +17,12 @@ jobs:
       run: rustup component add rustfmt
     - name: Install clippy
       run: rustup component add clippy
+    - name: Install Wasm target
+      run: rustup target add wasm32-unknown-unknown
     - name: Build
       run: cargo build --verbose
+    - name: Wasm build
+      run: cargo build --target wasm32-unknown-unknown
     - name: Build examples
       run: cargo build --examples --verbose
     - name: Run tests