update workflow to work and test multiple features

.github/workflows/rust.yml

@@ -14,9 +14,17 @@ jobs:
 
     runs-on: ubuntu-latest
 
+    strategy:
+      matrix:
+        features:
+          - hashmap
+          - btreemap
+
     steps:
     - uses: actions/checkout@v3
-    - name: Build
-      run: cargo build --verbose
-    - name: Run tests
-      run: cargo test --verbose
+
+    - name: Build with ${{ matrix.features }} features
+      run: cargo build --verbose --features ${{ matrix.features }}
+
+    - name: Run tests with ${{ matrix.features }} features
+      run: cargo test --verbose --features ${{ matrix.features }}