ci: re-enable wasm check

But without default features, because the 'getrandom' dep from cookie
has decided it won't build on wasm. Fun!

.github/workflows/ci.yaml

@@ -67,22 +67,19 @@ jobs:
     - name: docs
       run: cargo doc --no-deps
 
-  # check_wasm:
-  #   name: Check wasm targets
-  #   runs-on: ubuntu-latest
+  check_wasm:
+    name: Check wasm targets
+    runs-on: ubuntu-latest
 
-  #   steps:
-  #   - uses: actions/checkout@master
+    steps:
+    - uses: actions/checkout@master
 
-  #   - name: Install nightly with wasm32-unknown-unknown
-  #     uses: actions-rs/toolchain@v1
-  #     with:
-  #       toolchain: nightly
-  #       target: wasm32-unknown-unknown
-  #       override: true
+    - name: Install nightly with wasm32-unknown-unknown
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: nightly
+        target: wasm32-unknown-unknown
+        override: true
 
-  #   - name: check
-  #     uses: actions-rs/cargo@v1
-  #     with:
-  #       command: check
-  #       args: --target wasm32-unknown-unknown
+    - name: check
+      run: cargo check --target wasm32-unknown-unknown --no-default-features --features=fs,serde